S04E12: The Vimo Plant

Kwon Joo and Derek chase after the person who snuck into the dorm. Kwon Joo sees something from a past dream that she had. Derek saves her from imminent danger, and they find out why they both saw strange visions. As the secrets of Sonang Village slowly come to light, Woo Ju informs the team that Saet Byeol has disappeared from the shelter.