Basic Info.

​A 17-year-old high school student, Na Bo-ra, embarks on a mission to help her best friend, Yeon-doo, achieve her first love. Before Yeon-doo leaves for the United States for heart surgery, she falls for Baek Hyun-jin, a boy she met at school. To support her friend, Bo-ra takes on the task of gathering information about Hyun-jin. However, as Bo-ra gets closer to Hyun-jin's friend, Pung Un-ho, she starts developing feelings for him. When Yeon-doo returns after her surgery, it is revealed that the person she truly loves is Un-ho. For the sake of her friendship, Bo-ra decides to conceal her own emotions.​

Additional Info.

​Cho Seong-mo's iconic song To Heaven is featured in 20th Century Girl. The song was composed in memory of Cho Seong-mo's older brother, who tragically passed away in a hit-and-run accident. Its title, To Heaven, signifies "sending to heaven." In the film, the song is poignantly used during scenes that reminisce about cherished moments from the past, amplifying the emotional resonance of the narrative.​