In-seong and Se-yeon now shares the secret about Seon-ju trapped in a smartphone. The closer they get to the truth, the bigger the suspicion against him grows. Bumyoung’s executive director, Mi-ran’s advice, “Don’t trust Kim Seon-ju too much” keeps bothering In-seong, and he ends up checking out the place where Seon-ju went missing. There, he encounters a mysterious man.