"Youth") is a 2000 South Korean coming-of-age film written and directed by Kwak Ji-kyoon.
[1] Kim Ja-hyo, a teenage boy, moves to a new high school in his senior year.
Since then, though Ja-hyo sleeps around in college, he is unable to form lasting attachments with women.
Meanwhile, Ja-hyo's best friend Lee Su-in develops a crush on the new teacher, Yun Jeong-hye.
Heartbroken, Su-in gets involved with an older woman in college, but continues to pine after Jeong-hye, sending her countless letters.