Yoo Kang Mi (played by Lee Yeon Hee) appears to be jealous when it comes to Park Ki Young (played by So Ji Sub)'s love life.

On the latest episode of SBS Wednesday-Thursday drama 'Ghost', the two characters begin investigating whether Kim Woo Hyun is behind the murder of Shin Hyo Jung.

Lee Yeon Hee's character betrays her emotions when So Ji Sub lies to her that he kissed murder suspect Koo Yeon Joo (played Yoon Ji Hye), becoming sensitive and wearing a strange expression on her face. She asks him whether he really kissed her, and So Ji Sub replies, "Why? Am I not allowed to kiss her?", drawing the jealousy out of Lee Yeon Hee.

Meanwhile, the episode also features the two arresting the 'legendary answer sheet' killer, a student who killed a fellow scholarship candidate at Yoo Kang Mi's old high school.