If you could take the fact that she has lost Sumin forever the day she made her mistake, you would see that her being able to see and talk to Sumin for 10 years more after that incident could also be considered as her gain.

Sorry, been lurking here since last year and this probably is the most funniest thing I've ever heard. I can't believe you could think of the situation this way. Should I say Sumin should have felt lucky since she still had Seju there to play this total shit with her? You were cheated. You were disappointed. You were depressed. You came to another woman. That woman ditched you. You went back to your ex. You slept with other women. You ditched them. Your ex was still there when you're down?

I didn't see many of Sumin's good points until those flashbacks with Seju. She was cute, & had that shining light of a girl next door that can melt your heart in a blink of eye. But she changed. She chose to live in hatred for freaking 10 years. Even when their relationships were totally fine before the cheating, Sungji could forgive but Sumin couldn't? Why was that? She put the blame on Seju for her parents' accident. She broke contact with her for a month. Seju was blocked by that high ego wall that she built when she came to comfort her. It was her biggest mistake when she slept with the bartender but was it entirely her fault? Absolutely not.

Sumin did not give her a second chance once because she was hurt and could trust no more. Then, there was no such reason for her to treat Seju like a toy. No one deserved that 10 years of torture, including Sumin. If only Seju knew that cheating made her lose Sumin forever, she would possibly move on or live in memories alone or commit suicide right away. But nobody was there to tell her that, she's not us who read wdtfs and knew its end. Nobody told her no matter how long she'd been waiting, she would still only be the option after Sumin broke up with another girl. In a situation where you don't even know what you've been waiting for, suppose it's really for 10 years in real life, I call it blindness and stupidity. If only Sumin could determinedly show the line in between that they could never cross, there would not be this waste of time. Sumin was a coward for not being able to admit her love for Seju, if she still loves then just let Seju come back to her. If she doesn't then just break everything, it's not like their relationship was unbroken, why there is the need to be afraid of getting hurt? She simply didn't dare break contact bc she might feel lonely the moment Seju was gone. The same as that year when she asked Seju to stay. She did not care how much trouble Seju will get from her family after that. And when Seju really leaves, she's crying for someone else. That's okay. "You do not need to stay bc I have Sungji now". Is that it? Love is selfish, they said in the end you only love yourself. You don't want one person to get hurt bc that's the reason why you'll be hurt. However, SuminxSungji is much better, they can have friends, normal life, don't have to worry about anything. Truthfully, there shouldn't be Seju from the start lol.