Turn Around at Samgakji(1970)

Original title: 돌아가는 삼각지

Kind-hearted orphaned Hye-sook loves Minsu, but her parents disapprove. They promise to reunite years later after achieving success. A decade on, Minsu has fallen into gangster life and frequent imprisonment. Though still longing for Hye-sook, he’s pulled back to crime until Hye-sook's tearful plea and the intervention of a detective inspire him to change his life.