
From what I read from others, The new BF’s ex hurt him but he lied to Tae and made it seem like Tae was the one that did it and that’s the reason they ultimately ended up together. Tae finds out that he lied and broke up with him.
I also read some people saying that the new BF knew about Yoon but didn’t tell Tae, I also don’t know if that’s true or not since I haven’t read the novel. I saw Ch.37 where it looks like they broke up but idk....could you link the chapter where Tae and Kwon are fighting over Yoon?

Thank you! Okay so I quickly translated it on my phone...
Kwon thinks there wasn’t anything wrong with their relationship and doesn’t understand why Yoon ended it and is asking him again. Yoon isn’t really saying much and Keon yells that it feels like he’s talking to himself. Tae hears arguing,Yoon tries to be polite and Kwon jumps in and introduces himself...the conversation goes on and Kwon says something about if Tae wants to stay uninvolved (in Yoons life) then he should stay consistent. I think he says something about him picking up what Tae threw away? And he says now he’s telling him (Tae) to not snoop around with ridiculous excuses. Tae yells that he (Kwon) doesn’t know how he feels. Kwon says he doesn’t care & their business isn’t his. He doesn’t care about how much Tae sacrificed or how hard of a time he had cause he doesn’t have time to focus on Taes problems. Yoon steps in and stops Kwon and tells Tae that he’ll meet him outside the company if he has something to say. Kwon gets angry, Yoon asks for some time, Tae says not to keep Yoon out in the street fighting, Keon says something like “look who’s talking”. Yoon tells Kwon something about being at work and Kwon says “don’t think I’m gonna be fine. It’s not like everyone’s waiting for you. (???) Haven’t you already experienced it?”
But again nothing is accurate because I translated it from Papago
The angst is coming...
But honestly though, I can't seem to hate any of them, not even the ex or the ex's new lover. Overall, its a masterpiece of a manhwa, not bias on any sides. Each coin has two sides, and we need to see both of them to see what it truly is. Hard to blame anyone for this matter, i mean waiting for 5 years is bound to break someone. Its a very messy relationship though and I hope the MC learns to appreciate himself more.