Song Shi Ho

Bok-joo's roommate and Joon-hyung's ex-girlfriend. She still has feelings for him and initially becomes jealous of his and Bok-joo's strong relationship, leading her to expose Bok-joo's secret trips to Jae-yi's clinic to Bok-joo's father and coaches at one point. After Bok-joo saves her life and sent her to the hospital on time, her relationship between her and Bok-joo and Joon-hyung gradually improves. She is a top-class rhythmic gymnast, who won a silver medal at the Asian Games at the age of eighteen, but she returns to the sports university due to a decline in her performance. Shi-ho is an overachiever and is under constant stress about her weight and skills, which led to her break-up with Joon-hyung, a psychiatric eating disorder and act rashly in various situations.