The plot was good, honestly, but the ending didn't make sense at all. The gangster is nearly a 50-year-old man who lived 48 years, even if they were full of hardships and regrets. He still lived his life and even achieved his dreams when he got into the boy's body. At this point, he should have been the one to leave, not the young boy who didn't get to live a full 19 years.

The boy had a horrible life, so of course, he wouldn't know how valuable his life is and didn't hold on to it. In that scene, the gangster's duty was to let the boy stay and guide him. Instead, he accepted the fact that the boy didn't want to live and just let him go. That man DIDN'T EVEN RESIST! For me, that scene ruined the whole watching experience.