Mo-mo goes missing after a scuba diving accident. Ba-ra, a journalist, senses something suspicious about the case, while Yong-jung also feels an unsettling vibe from Ju-shin. Meanwhile, Ba-ra reveals the engagement of Ju-shin and Mo-mo in an exclusive interview without informing him, as Mo-mo calls 911 to report her mother's death.

Ju-shin begins to feel a growing sense of unease toward Ran-hee, who now has Mo-mo's appearance. Over a meal with Jin-ju, Ju-shin tries to gauge her feelings. Meanwhile, Yong-jung confesses his feelings to Ba-ra, and Ba-ra begins to see hallucinations of Mo-mo.