Trap of Youth (1999)

Yun Hee sacrifices her studies and makes money to support her boyfriend's college fees, and later gives birth to a son of his. Yet the boyfriend betrays her love and falls for a rich girl. Yun Hee tries to break their relationship by getting close to the girl's brother. However, she cannot hurt her ex-boyfriend and her present boyfriend who is madly in love with her. Eventually, her boyfriend Young Guk, moves her and dissolves her hatred with true love