‘Love in Disguise’: Business Proposal Star Seol In Ah Returns With a Romantic Thriller — Cast, Release Date and Everything You Need to Know

Seol In Ah is trading the familiar office-romance formula for something considerably more dangerous. The Business Proposal actress returns with Love in Disguise, an upcoming Korean drama that combines undercover investigations, a suspicious chaebol heir, a hidden identity, and a romance neither lead appears prepared for.

Co-starring Yim Si Wan, the series follows a former special forces officer who disguises herself as a man to work as the personal secretary of a wealthy businessman suspected of murder. What begins as an undercover mission soon becomes a complicated game of suspicion, attraction, and secrets. The closer the two get, the harder it becomes to separate the investigation from their growing personal connection.

Scheduled to premiere on October 19, 2026, Love in Disguise is one to watch for viewers who enjoy romantic thriller K-dramas, workplace tension, gender-disguise stories, and relationships that develop under unusual circumstances. Here is everything to know about its release date, cast, storyline, streaming details, and what makes Seol In Ah’s latest drama stand out.

Love in Disguise: Release Date, Cast and Key Details

Before getting into the plot, here are the essential details about the upcoming Love in Disguise Korean drama.

The drama is scheduled to air in South Korea on Mondays and Tuesdays, beginning at 8:50 p.m. KST. Indian streaming listings also point to an October 19 arrival on Prime Video. Availability and episode timing can vary by region, so viewers should check the local platform listing closer to release.

What Is Love in Disguise About?

At the centre of Love in Disguise are Yoon Yi Jun, a privileged heir to a powerful business empire, and Kang Jae Hee, a determined investigator with military training. Their lives collide when Yi Jun becomes a murder suspect and Jae Hee takes an unconventional approach to uncovering the truth.

Yi Jun, played by Yim Si Wan, is the third-generation heir to Taegang Group. He has the intelligence, appearance, and social position expected of a powerful executive, but his perfectionism and difficult personality make him an intimidating boss. His world becomes even more complicated when a murder investigation places him under suspicion.

Jae Hee, portrayed by Seol In Ah, is a detective and former special forces officer who is willing to put herself in danger to catch a criminal. To investigate Yi Jun from close range, she disguises herself as a man and applies for a position as his personal secretary. Her cover gives her access to his private world, but it also places her in the uncomfortable position of working directly for the very man she suspects.

The premise creates two kinds of tension. The first is the mystery: is Yi Jun responsible for the crime, or is someone using his position to frame him? The second is personal. As Jae Hee spends more time with her employer, she begins to encounter sides of him that do not fit neatly with her initial assumptions.

The drama’s undercover detective romance also introduces the risk that Jae Hee’s identity could be exposed before she discovers what is really happening. Meanwhile, Yi Jun begins to question the person who has entered his life under false pretences. Their competing secrets give the series a natural source of suspense beyond the romance itself.

Love in Disguise Cast: Who Plays Whom?

One of the biggest attractions of Love in Disguise is its central pairing. Seol In Ah is known for bringing energy and confidence to romantic roles, while Yim Si Wan has taken on a range of characters across romance, psychological drama, and thrillers. Their first on-screen collaboration gives the series a fresh pairing to build around.

Seol In Ah as Kang Jae Hee

Seol In Ah plays Kang Jae Hee, a fearless investigator whose background in the Republic of Korea Army Special Warfare Command gives her the physical skills needed for dangerous undercover work. Her character is trained in martial arts and is prepared to take risks when she believes a suspect needs investigating.

Jae Hee’s biggest challenge, however, is not simply physical. She must maintain a convincing male disguise while working in close proximity to Yi Jun. Every conversation, unexpected situation, and moment of suspicion threatens to complicate her mission.

For viewers who remember Seol In Ah as the lively and confident Jin Young-seo in Business Proposal, this role offers a different kind of performance. Rather than relying primarily on romantic comedy, Seol In Ah’s new K-drama places her in an action-oriented role that requires discipline, deception, and emotional restraint.

Her character also has an intriguing conflict at the heart of the story: Jae Hee must investigate Yi Jun objectively, even as her growing familiarity with him threatens to change how she sees him. Whether that personal connection becomes an advantage or a weakness is one of the drama’s central questions.

Yim Si Wan as Yoon Yi Jun

Yim Si Wan plays Yoon Yi Jun, the next heir to Taegang Group and the businessman at the centre of the murder investigation. His character is described as a perfectionist with a cold exterior, someone whose demanding behaviour makes it difficult for others to get close to him.

Yi Jun’s privileged position does not protect him from suspicion. When a murder case puts him under police scrutiny, his carefully controlled life becomes vulnerable to outside interference. Hiring a new secretary creates an opportunity for Jae Hee to investigate him, but it also gives Yi Jun a chance to observe the person who has entered his private circle.

Yim Si Wan’s casting is particularly interesting because the role combines the authority of a wealthy corporate heir with the vulnerability of someone whose reputation and freedom may be at risk. His character must also navigate the growing attraction and distrust that develop between him and Jae Hee.

For international viewers who recognise Yim Si Wan from Squid Game, Love in Disguise offers a different setting in which to see him. The series leans into corporate intrigue, romantic tension, and mystery rather than survival-game horror.

Kim Jung Hyun as Kim Si Hyun

Kim Jung Hyun takes on the role of Kim Si Hyun, Yi Jun’s close friend and an attorney connected to Taegang Group’s legal team. His character is positioned near the centre of the corporate and legal complications surrounding the main mystery.

Si Hyun is not simply a supportive friend who helps Yi Jun navigate a difficult period. Early character descriptions suggest that he also has a more mysterious side, making his role worth watching as the investigation develops.

Kim Jung Hyun is familiar to K-drama audiences through projects including Crash Landing on You and Mr. Queen. His presence adds another recognisable face to the ensemble, while his character’s professional and personal ties to Yi Jun could make him important to the unfolding mystery.

Yeonwoo as Lee Hye Jung

Yeonwoo plays Lee Hye Jung, the secretary to Taegang Group’s chairman. She is described as composed and difficult to read, with a personality that appears to change outside working hours.

Her position places her within the corporate environment surrounding Yi Jun, where information, loyalty, and appearances could become crucial to the investigation. As Jae Hee attempts to work out what is happening inside the company, characters such as Hye Jung may prove important to understanding its internal relationships.

Yeonwoo’s character adds another layer to the drama’s secretive workplace atmosphere. In a story built around disguises and hidden motives, a seemingly controlled character whose behaviour changes depending on the situation naturally invites questions about what she knows and where her loyalties lie.

Supporting Cast

The supporting cast also includes Ryu Seung Soo, Park Jun Myun, Jeong Han Seol, Kim Do Yoon, Jung Yoo Min, and Kim In Kwon, according to current drama listings. Their characters broaden the story beyond its central couple and corporate investigation. Some character descriptions and plot roles may become clearer as tvN releases further previews and episodes.

Love in Disguise Release Date: When Does It Premiere?

The Love in Disguise release date is October 19, 2026. The series is scheduled to premiere on tvN in South Korea at 8:50 p.m. KST, with new episodes planned for Mondays and Tuesdays.

The premiere schedule makes the drama a potential choice for viewers who prefer following an ongoing series rather than waiting for an entire season to arrive at once. Its combination of romance, comedy, and a continuing murder mystery also gives each episode more than one storyline to develop.

The first episodes will need to establish how Jae Hee enters Yi Jun’s workplace, what initially makes him a murder suspect, and how she maintains her disguise. They will also introduce the supporting characters surrounding Taegang Group, whose relationships may help explain the events behind the investigation.

As of October 10, 2026, the drama has not premiered yet. Details about the final resolution, the identity of any culprit, and the ultimate direction of the central romance should therefore be treated as unknown rather than confirmed.

Where to Watch Love in Disguise Online

For viewers , Love in Disguise is listed for streaming on Amazon Prime Video from October 19, 2026. GQ India has also reported Prime Video as the Indian streaming destination, while current streaming listings show the same date.

The drama will air on tvN in South Korea. International viewers should check Prime Video in their own country to confirm the local listing, availability, subtitle options, and episode-release schedule. Streaming rights can differ by territory, so a title appearing in one country’s catalogue does not guarantee identical access everywhere.

If you are planning to watch from India, searching for the full title Love in Disguise Korean drama on Prime Video around its premiere date is the simplest way to find the official listing. Avoid unofficial uploads that may offer incomplete episodes or misleading release information.

Is Love in Disguise Based on a Webtoon?

Yes. Love in Disguise is based on a web novel and webtoon known by the literal English title Why Don’t You Know She’s a Woman? The adaptation brings its central premise of a woman concealing her identity to investigate a powerful man into a live-action Korean drama.

That source material helps explain why the series blends several familiar K-drama ingredients. It has the secret identity of a disguise romance, the class divide of a chaebol story, the proximity of an office drama, and the stakes of a murder mystery. The adaptation can use the visual language of television to turn those elements into awkward workplace encounters, suspicious exchanges, and moments in which the leads struggle to maintain control of the situation.

The important distinction is that Love in Disguise is not being promoted as a straightforward remake of Business Proposal. Seol In Ah’s earlier drama may have helped establish her popularity with romance viewers, but this new series has its own source material, characters, and mystery-driven plot.

Why Love in Disguise Could Be Worth Watching

The most promising element of Love in Disguise is the way its romance and mystery depend on the same secret. Jae Hee needs to remain close to Yi Jun to investigate him, but her disguise makes honest communication almost impossible. Meanwhile, Yi Jun’s suspicion of the people around him may make it harder for him to recognise who is genuinely trying to help him.

That setup creates a more complicated relationship than a typical office romance. The leads are not simply colleagues who slowly develop feelings for one another; one of them is investigating the other, and neither begins the story with complete trust. The emotional consequences of that arrangement could become as important as the question of who committed the crime.

The series also has room to balance tension with comedy. Jae Hee’s male disguise puts her in awkward situations at work, while Yi Jun’s perfectionism creates its own daily challenges. Those lighter moments can offer relief from the murder investigation without removing its stakes.

For fans of Korean romantic thrillers, the appeal lies in that mix of genres. Viewers get a developing relationship, a corporate setting filled with secrets, an undercover protagonist, and a central suspect whose guilt remains a question. The success of the formula will ultimately depend on how convincingly the show develops its mystery and whether the leads’ relationship feels earned rather than rushed.

Love in Disguise Trailer: What Has Been Revealed?

tvN released a teaser trailer ahead of the premiere, offering a first look at the investigation and the growing suspicion between the leads. It opens with Yi Jun standing near an unconscious woman, after which the police begin investigating his connection to the apparent crime. Yi Jun questions whether anyone genuinely believes he is responsible.

Jae Hee then learns that Yi Jun is looking for a male secretary. Rather than abandoning the investigation, she decides to use the requirement to her advantage, disguising herself as a man and securing the position. The teaser shows her trying to observe Yi Jun and the people around him while navigating the awkwardness of her new workplace.

The preview also suggests that the deception will not remain one-sided. As Jae Hee notices circumstances she cannot explain, Yi Jun begins questioning her identity and motives. The trailer ends with him directly challenging her about who she really is and who sent her.

That final confrontation sets up the series’ central tension: Jae Hee needs to protect her cover long enough to uncover the truth, while Yi Jun may be getting close to discovering the secret that brought her into his life.

Final Thoughts: Is Love in Disguise Worth Adding to Your Watchlist?

Love in Disguise has a strong hook for viewers looking for a Korean drama that balances romance with a genuine mystery. Seol In Ah’s undercover investigator, Yim Si Wan’s suspicious chaebol heir, and the tension surrounding a murder case give the series several ways to build both emotional and narrative stakes.

Its biggest question is whether the show can make the central romance believable while keeping the investigation compelling. Jae Hee’s disguise creates opportunities for comedy, but it also places trust at the heart of the story: what happens when someone begins falling for the very person they were sent to investigate?

With its October 19, 2026 premiere approaching, Love in Disguise is worth keeping on the radar for fans of Seol In Ah, Yim Si Wan, and romantic thriller K-dramas. The premise promises more than a conventional office romance, although the series will need to deliver on both its mystery and character development to make the combination work.

Frequently Asked Questions About Love in Disguise

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About The Author

Abhishek Kumar

Abhishek Kumar is an entertainment content strategist and writer focused on Hollywood, sports cinema, and pop culture. With a keen understanding of audience interests and search trends, he creates engaging, high-ranking content that keeps readers informed about the latest in film, streaming, and fandom culture.

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