Male University Student Likes Lee Dorae. Close friends with Won Hyoseop, Jung Siho, and Ji Jaeyeon. Seo Gahee's ex-boyfriend. Has a delinquent streak. Lost his memory in a car accident, leaving his mind stuck at age 18. Because of this, he broke up with Seo Gahee and is now pursuing Lee Dorae, his high school classmate and first love, to try and date her.

Male University Student One year younger than Cha Haewon and Jung Siho. Close friends with Cha Haewon, Jung Siho, and Ji Jaeyeon. Bright and very friendly.

Male University Student Close friends with Cha Haewon, Won Hyoseop, and Ji Jaeyeon. Close with Hwang Isol. Has a blunt and cold side.

Male University Student Close friends with Cha Haewon, Jung Siho, and Won Hyoseop. Kind-hearted. Harbors a certain level of interest in Lee Dorae.

Female University Student Cha Haewon's ex-girlfriend. Acts like she doesn't care about the breakup in front of others, but in reality, she is deeply bothered by it and is jealous of Lee Dorae. Despite her jealousy, she maintains a friendly relationship with Lee Dorae.

Female University Student Feels an attraction toward Cha Haewon. Timid and quiet. Becomes more talkative and brighter once she gets close to someone, but remains fundamentally timid and quiet. High school classmate of Cha Haewon. Loves rock bands. Acquainted with Ji Jaeyeon. Close friends with Hwang Isol.

Female University Student Easygoing with strong leadership skills. Likes Jung Siho. Close friends with Lee Dorae. Can seem a bit cold before you get to know her, but becomes completely bright and cheerful once you're close.