My First First Love

Yun Tae-o turns 20 and inherits his grandfather's house, only to discover that living alone is more challenging than he expected.

Han Song-i, Seo Do-hyeon, Oh Ga-rin, and Choe Hun arrive at Tae-o's home, only to find he is not there. Meanwhile, Tae-o receives troubling news regarding Han Song-i.

Tae-o unexpectedly finds himself with housemates and faces further complications when he discovers troubling news about Song-i during a dinner with his family.

Tae-o reflects on something he overheard and becomes certain of its meaning. Grateful for past kindness, Ga-rin organizes a party that draws Do-hyeon's unexpected attendance.

Tae-o's misunderstandings of Song-i's intentions strain their relationship, while Do-hyeon becomes increasingly curious about the nature of Song-i's connection with Tae-o.

Tae-o makes progress in his relationship with Ryu Se-hyeon, but is taken aback by the condition of her home. Meanwhile, Do-hyeon and Song-i attempt to clarify the nature of their connection.

Tae-o's irritation with Song-i's enigmatic boyfriend escalates, especially when she discovers that her friend's crush is someone Tae-o knows and dislikes.

Tae-o suggests a road trip, and the housemates are joined by Do-hyeon and Se-hyeon. During the trip, Tae-o encounters Song-i with an unexpected person.

Tae-o comes to terms with the relationship developing between Song-i and Do-hyeon, offering guidance, though Do-hyeon remains determined to follow his own path.

Tae-o faces a difficult decision that leads to a personal realization, while Song-i reveals her intention to move out following Hun and Ga-rin's decision to leave the house.

Do-hyeon discusses the family's financial situation openly with his father. Meanwhile, Song-i travels to Jeonju and encounters an unexpected familiar face.

Song-i begins to understand the significant role Tae-o has played in her life, while Do-hyeon grows concerned and frustrated when Song-i ignores her calls.

Song-i visits Tae-o to return an item, reigniting memories of their past. Meanwhile, Tae-o's family works to conceal a hidden secret.

Hun and Ga-rin share important information with the group, prompting a shift in dynamics. Meanwhile, Song-i initiates a conversation with Tae-o's father, leading to an unexpected outing between Song-i and Tae-o.

Tae-o shares an unusual observation he made at the restaurant with Song-i and decides to seek the full story from his father.

Tae-o and his friends experience personal growth as they explore themes of friendship, family, and love, while Song-i prepares for a significant job opportunity.