Min Gu enters Wooyeon University with a high score; Min Gu finds out that he's assigned to the same room as Seung Bae, a 75-year-old freshman; Min Gu finds Seung Bae bothering as Seung Bae keeps eating his food without asking him first.

Min Gu and Yeo Wool, a social butterfly freshman with the same major as Min Gu, start to be drawn to each other; Min Gu and Seung Bae keep squabbling over nothing every time they are together; the frustrating high school life of Min Gu is revealed.

Yeo Wool gives her phone number to Seung Bae and asks him to pass it to Min Gu; Jeong Tae has feelings for Yeo Wool and keeps flirting with her; the freshmen go on a retreat and play various games; Seung Bae tries to play matchmaker.

Min Gu musters up the courage and goes up on the stage to sing; the freshmen are given an assignment to make a short video, and Yeo Wool, Min Gu, and Seung Bae form a group to work on it; Yeo Wool gets a weird message about Min Gu from Do Gyun.

Min Gu tells Yeo Wool about what happened between him and Do Gyun in the past.

Seung Bae collapses while coughing; Min Gu takes him to the hospital, where he learns about Seung Bae's terminal illness; Min Gu finds a book Seung Bae was reading; in the book, Min Gu discovers the letter Min Gu left for him.