Love in Disguise: Seol In Ah & Im Siwan K-Drama, Cast, Release Date
Seol In Ah is trading the familiar rom-com territory of Business Proposal for something far more dangerous with her upcoming K-drama Love in Disguise. The new tvN series brings together Seol In Ah and Im Siwan for the first time, combining undercover espionage, a murder investigation, office tension and an increasingly complicated romance.
The premise alone gives the drama plenty to work with. Im Siwan plays a wealthy chaebol heir who suddenly becomes the prime suspect in a murder case, while Seol In Ah’s character goes undercover by disguising herself as a male secretary to investigate him.
What begins as an undercover mission gradually becomes much harder to define as the two characters spend more time together.
With Love in Disguise arriving on tvN in October 2026 and streaming on Prime Video in India, here’s everything to know about the upcoming Korean drama, including its release date, cast, plot and characters.
When is Love in Disguise releasing?
Love in Disguise premieres on October 19, 2026, on South Korean network tvN. The drama will air in the Monday-Tuesday slot.
For viewers in India, the upcoming K-drama will be available to stream on Amazon Prime Video.
The series is particularly interesting for fans of Korean romantic thrillers because it isn’t built around a straightforward love story. Its central mystery gives the romance another layer, with the relationship between the leads developing while one character is secretly investigating the other.
What is Love in Disguise about?
Love in Disguise follows Yoon Yijun, played by Im Siwan, a wealthy heir to Taegang Group whose seemingly perfect life takes a dramatic turn when he becomes a murder suspect.
Yijun has the looks, intelligence and social status expected from a classic chaebol protagonist, but his personality is considerably less charming. He is known for being an extremely demanding boss whose perfectionism and sensitivity have driven employees away.
After the murder takes place inside his company, Yijun finds himself increasingly isolated. With suspicion surrounding him, he eventually hires a new personal secretary.
That is where Kang Jaehee enters the story.
Played by Seol In Ah, Jaehee is a former special forces officer with impressive combat skills. But she isn’t actually there simply to work as Yijun’s secretary. She disguises herself as a man and infiltrates his inner circle as part of an investigation into the murder.
Her objective is straightforward: find out whether Yijun is responsible and uncover what really happened.
The problem is that spending every day with Yijun makes the investigation considerably more complicated.
Seol In Ah plays a former special forces officer
Seol In Ah takes on a very different kind of character in Love in Disguise.
Her character, Kang Jaehee, is a highly trained former special forces officer who has the physical ability and investigative skills required for the dangerous undercover assignment.
Instead of approaching Yijun openly, she disguises herself as a male secretary and becomes part of his daily life.
That setup creates one of the drama’s biggest sources of tension. Jaehee has to maintain her disguise while dealing with an unpredictable employer and simultaneously trying to determine whether he is connected to the murder.
For Seol In Ah, the role also offers a noticeable change from the lighter romantic material that introduced her to many international viewers, particularly her appearance in Business Proposal.
Im Siwan plays a chaebol heir and murder suspect
Im Siwan plays Yoon Yijun, the heir to Taegang Group.
On paper, Yijun looks like the kind of character who should have everything under control. He comes from a powerful family, is intelligent and successful, and possesses the wealth and influence associated with a third-generation chaebol.
His biggest problem is his personality.
Yijun’s perfectionism makes him an intimidating boss, while his extreme sensitivity reportedly makes working around him difficult. His employees struggle to tolerate his behaviour, leaving him increasingly isolated.
Then a murder connected to his company turns his already complicated life upside down.
Suddenly, Yijun isn’t merely the difficult heir at the centre of a corporate empire. He is a potential murder suspect.
His new secretary may be the person closest to him, but she is also secretly investigating him.
The undercover secretary twist makes the romance complicated
The most intriguing part of Love in Disguise is the relationship between Yijun and Jaehee.
At first, their connection is entirely based on deception.
Yijun believes he has hired a male secretary, while Jaehee knows that her entire identity inside his workplace is part of an undercover operation.
As she spends more time around him, however, the boundaries between professional duty and personal feelings begin to become less clear.
The drama plays with several different dynamics at once. Yijun is the boss, Jaehee is his secretary, Jaehee is secretly an investigator, and Yijun is also the person she is investigating.
That creates a relationship where neither character has complete information about the other.
What initially looks like a murder investigation can therefore turn into something much more complicated.
Who is in the cast of Love in Disguise?
The main cast of Love in Disguise is led by Im Siwan and Seol In Ah, marking their first on-screen collaboration.
Im Siwan stars as Yoon Yijun, the Taegang Group heir who becomes embroiled in a murder investigation.
Seol In Ah plays Kang Jaehee, the former special forces officer who disguises herself as a male secretary to investigate Yijun.
The supporting cast includes Kim Jung Hyun, who plays Kim Sihyun, Yijun’s best friend and an attorney working on Taegang Group’s legal team.
Yeonwoo plays Lee Hyejung, a secretary at Taegang Group who is described as the chairman’s shape-shifting secretary.
Together, the characters create a workplace filled with hidden motives, shifting loyalties and relationships that are not necessarily what they appear to be.
Kim Jung Hyun plays Yijun’s mysterious best friend
Kim Jung Hyun joins the drama as Kim Sihyun, Yijun’s best friend and an attorney on Taegang Group’s legal team.
His position inside the company puts him close to the murder investigation, while his friendship with Yijun gives him another connection to the central mystery.
For viewers familiar with Kim Jung Hyun from dramas such as Crash Landing on You, his role here provides another reason to keep an eye on the supporting cast.
His character could also become important as the story gradually reveals more about the people surrounding Yijun and the company.
Yeonwoo plays Taegang Group’s secretary
Yeonwoo takes on the role of Lee Hyejung, another secretary connected to Taegang Group.
Unlike Jaehee, whose identity is deliberately concealed, Hyejung is already part of the company’s inner world.
Her position gives the drama another character who can potentially influence the complicated relationship between Yijun and Jaehee.
With several characters operating around the same corporate environment, Love in Disguise appears to be setting up a story where personal relationships and the murder investigation constantly overlap.
Is Love in Disguise a romance or thriller?
It’s both.
At its core, Love in Disguise combines romance, mystery and thriller elements. The central relationship gives the drama its romantic side, while the murder investigation provides the suspense.
The unusual identity setup adds another layer because Jaehee is hiding who she really is.
The result is less of a conventional office romance and more of a romantic mystery in which the characters are constantly trying to understand each other’s intentions.
That combination could make Love in Disguise particularly appealing to viewers who enjoy K-dramas that mix romance with secrets and investigations rather than keeping the two storylines completely separate.
Why K-drama fans should watch Love in Disguise
The biggest attraction is arguably the combination of Seol In Ah and Im Siwan.
This is their first drama together, which means viewers have no previous on-screen pairing to compare their chemistry against.
Then there is the premise itself. A chaebol heir accused of murder, a former special forces officer pretending to be a male secretary and a relationship that slowly becomes impossible to categorise is a much more unusual setup than the average workplace K-drama.
The drama also has enough mystery to keep the story moving beyond the romance.
Jaehee needs to discover the truth about the murder, but the closer she gets to Yijun, the harder it becomes to maintain the emotional distance required for her mission.
That tension could ultimately become the show’s biggest strength.
Love in Disguise release date and streaming details
Love in Disguise premieres on October 19, 2026, on tvN in South Korea.
The series will air every Monday and Tuesday.
For audiences in India, the drama will stream on Amazon Prime Video.
With Seol In Ah and Im Siwan leading the cast, the series is shaping up as one of the more intriguing new K-drama releases for fans looking for romance with a mystery-driven storyline.
Final verdict: Is Love in Disguise worth adding to your watchlist?
If you’re looking for another fluffy office romance like Business Proposal, Love in Disguise may surprise you.
The new K-drama takes the familiar workplace setting and adds a murder investigation, an undercover identity and a male-disguise storyline. Seol In Ah’s former special forces officer is hiding her true identity, while Im Siwan’s chaebol heir is hiding behind an increasingly complicated public image.
That gives the central romance plenty of room to develop while the mystery continues in the background.
And with October 19, 2026 set as the premiere date, Love in Disguise is one to keep on your K-drama watchlist.
Frequently Asked Questions
1. When does Love in Disguise premiere?
Love in Disguise premieres on October 19, 2026, on tvN in South Korea.
2. Where can I watch Love in Disguise in India?
The K-drama will stream on Amazon Prime Video in India.
3. Who stars in Love in Disguise?
The drama stars Seol In Ah as Kang Jaehee and Im Siwan as Yoon Yijun. Kim Jung Hyun and Yeonwoo are also part of the main cast.
4. What is Love in Disguise about?
The story follows a chaebol heir who becomes a murder suspect and a former special forces officer who disguises herself as his male secretary to investigate him.
5. Is Love in Disguise a romance K-drama?
Yes, but the series also combines romance with mystery, thriller and undercover-investigation elements.
6. Are Seol In Ah and Im Siwan working together for the first time?
Yes. Love in Disguise marks Seol In Ah and Im Siwan’s first on-screen collaboration.
7. Who does Seol In Ah play in Love in Disguise?
Seol In Ah plays Kang Jaehee, a former special forces officer who goes undercover as a male secretary while investigating Yoon Yijun.
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