Better to break off an engagement before you actually get married and waste time spending your lives together than staying in this marriage with trust issues and lies and just forcing yourself to accept this person who you no longer can stand
Marriage isn't something to be taken so lightly that you go forward with it just because it's the right thing to do. Joonhyuk made the correct choice.
Didn't mean "it's the right thing to do", I meant "it appears to be the right thing to do." I think the right thing was to break it off, Soojung is a proven liar and is very manipulative, there's no relationship when there's no trust. She's not even truly sorry to Taesoo, she's just sorry she was caught.
I totally believe she should be punished, throughly punished for the things she did. But to go back on a marriage proposal is weak, he should've known the person she was before making that kind of a promise.