On his 20th birthday, Yun Tae-o gets his grandfather’s house but soon finds that living by himself doesn’t come with all the perks he had imagined.
Han Song-i, Seo Do-hyeon, O Ga-rin, and Choe Hun all end up going to Tae-o’s place but he’s not home. Tae-o gets alarming news about Song-i.
Without knowing how it happened, Tae-o gets stuck having housemates and learns more bad news about Song-i when he goes home for dinner with his family.
Tae-o contemplates what he overheard and is convinced he knows what it means. To show her appreciation, Ga-rin throws a party, which Do-hyeon attends.
Tae-o keeps misreading Song-i, exacerbating the confusion between them. Do-hyeon wants to know more about Song-i’s relationship with Tae-o.
Tae-o makes a breakthrough with Ryu Se-hyeon but is shocked when he sees her house. Do-hyeon and Song-i try to figure out where they stand.
As Tae-o’s complaints about Song-i’s mysterious boyfriend grow, she becomes cross when she learns his crush is someone she knows -- and doesn’t like.
After Tae-o proposes the housemates take a road trip, they're joined by Do-hyeon and Se-hyeon. Tae-o sees Song-i with someone he didn’t expect.
Tae-o accepts the situation between Song-i and Do-hyeon and tries to offer advice, but Do-hyeon is adamant about doing things his way.
Tae-o gets an ultimatum and realizes something about himself. Song-i announces her plans to move out after Hun and Ga-rin decide to leave the house.
Do-hyeon and his father have a candid conversation about the family finances. Song-i heads to Jeonju and is surprised to run into someone she knows.
Song-i comes to realize that Tae-o has always been there throughout her life. Do-hyeon gets upset when Song-i doesn’t answer her phone.
Song-i stops by the house to return something to Tae-o, who reminds her how things used to be between them. Tae-o’s family tries to hide a secret.
Hun and Ga-rin have news for the group. Song-i decides to talk to Tae-o’s father. Tae-o ends up going on an outing with Song-i.
Tae-o tells Song-i about something odd he noticed at the restaurant and resolves to find out the whole truth from his father.
There may be more changes in the house, as Tae-o and his friends learn the true meaning of friendship, family and love. Song-i has a job interview.