My First First Love

On his 20th birthday, Yun Tae-o gets his grandfather's house but soon discovers that living by himself doesn't come with all the perks he had imagined.

Han Song-i, Seo Do-hyeon, Oh Ga-rin, and Choe Hun all wind up going to Tae-o's place but he's not home. Tae-o receives alarming news about Song-i.

Without knowing how it happened, Tae-o is stuck having housemates. He finds out more bad news about Song-i when he goes home for dinner with his family.

Tae-o ponders what he overheard and is convinced he knows what it means. Ga-rin throws a party to show her appreciation, and Do-hyeon attends.

Tae-o keeps misreading Song-i, which worsens the confusion between them. Do-hyeon wants to know about Song-i's relationship with Tae-o.

Tae-o makes a breakthrough with Ryu Se-hyeon but is surprised when he sees her house. Do-hyeon and Song-i try to determine where they stand.