At first it may seem romantic to have a ring that you can't take off. That will bind you to someone that you love at the moment forever. Then you realize you can't take it off for any reason, you need to wash your hands, you're cooking a meal, you need to apply lotion! You can't take it off! Now your finger is growing bacteria under your ring and it's starting to smell and change colors. You're starting to resent your husband from giving you a stupid ring you can't take off. But then the it hits you that you can't leave him. You're stuck with him because of the stupid ring that refuses to come off. Now you have no choice, you either deal with having a stupid annoying husband that gave you an infected finger or cut off your finger. ┑( ̄Д  ̄)┍
This story isn't about a cute couple who loves each other. This is about their eventual downfall. Sangwoo is a murderer, a sad back story doesn't erase all the innocent lives he has taken. Bum is still a crazy, obsessive, stalker that would love anyone that shows him a little kindness. That little peaceful period was just a part of the cycle of abusive in abusive relationships. No one deserves a happy ending in my book. They brought everything to themselves.