After facing a crisis at the hunting grounds, Hwan finds himself in an unbelievable situation. Jae-yi. claims that she's innocent and blames Hwan for the death of her family. Hwan is confused when he finds out Jae-yi knows about his secret. Meanwhile, Jae-yi's servant disguises herself as a man to learn from the mad scientist, Kim Myeong-jin.

Hwan can't trust Jae Yi and tells her to come find him in the East Palace one her own. To get there, Jae Yi turns herself into a eunuch. Meanwhile, Seong On is shock to learn that his father might have something to do with the written prayer incident.

Hwan gives Jae Yi a second test. She must figure out why the messenger he sent to Master Min's house was killed, and Jae Yi finds out it has something to do with Hwan. Finally, Hwan gives the last test which is to solve a serial murder case. Now Jae Yi must face her fiancé.