Im Siwan and Seol In-ah are set to star together in a comic yet suspense-filled romance drama.

On December 18, tvN confirmed the lead casting for its upcoming series My Guilty Human, with Im Siwan and Seol In-ah headlining the lineup. The drama is based on the popular KakaoPage web novel and webtoon Why Doesn't He Know I'm a Woman?, blending romance with high-tension thrills.

My Guilty Human follows the story of an arrogant third-generation chaebol who becomes a murder suspect and a detective who disguises herself as his male secretary to uncover the truth. The series promises a fast-paced mix of romance, psychological mind games, and chaotic teamwork between detectives.

Im Siwan takes on the role of Yoon Yi-jun, the next-in-line heir of the top-ranked Taegang Group. Gifted with both looks and intelligence, Yi-jun is a sharp, hyper-sensitive perfectionist whose presence heightens both tension and attraction throughout the story. Known for his genre-spanning versatility, Im Siwan is expected to deliver another tightly controlled, character-driven performance.

Seol In-ah stars as Kang Jae-hee, a skilled detective with a background in martial arts and special forces training. Determined to expose Yi-jun's true nature, she goes undercover as his male aide. Seol In-ah brings her signature bright energy to the role, adding charm and momentum to the unpredictable dynamic between the two leads.

As their time together grows, the relationship blurs the line between romance and bromance, unfolding into a sweet yet dangerous psychological battle filled with emotional tension and unexpected chemistry.

My Guilty Human is scheduled to premiere on tvN next year.