Man Weol tells Chan Seong to take good care of her. As Man Weol opens her heart to Chan Seong, new leaves start to sprout from the Moon Tree. Such a change agitates Man Weol and the staff of the hotel. They start to think everything has begun to change after Chan Seong joined the hotel. Meanwhile, the door to Room 13 is finally opened.

Man Weol and Chan Seong start to date without telling anyone in the hotel. A lunar eclipse occurs in 39 years, and humans get to see the presence of Hotel Del Luna. To greet special guests visiting on the day of the lunar eclipse, Chan Seong opens the door of Room 404. Meanwhile, Seol Ji Won, the serial killer, looks for Yu Na.