Young-Joon stays at Mi-So's place, but Kim Mi-So can't seem to relax with him in bed so she's trying to do all other things instead. Eventually, they decide to go to his place because it's much bigger and has multiple rooms. But Young-Joon is still worried and decides to stay next to her and ends up singing her a lullaby. To return the favour for a good-night sleep, she decides to make him a breakfast. More is revealed about Young-Joon past after the incident.

Young-Joon and Mi-So were preparing for a night together, but were abruptly interrupted by the problems at work. By the time the problem was solved, Mi-So already fell asleep and any attempt by Young-Joon to wake her up failed. Young-Joon had to go to business trip for a whole week and that will just add up to them missing each other. Go Gwi-Nam gets promoted and joins the rest of the team on the same floor. Mi-So's father ends up hospitalized and she spends some time taking care of him.

Everybody finds out about Young-Joon and Mi-So being in a relationship. Young-Joon tried to impress Mi-So's father.