Idk how to post spoilers in the reply but
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SPOILERS BELOW STOP NOW
MC was being blackmailed by someone in the military who found out he was in a relationship with the ML. To make sure the ML has a bright future and doesn't get tarnished by the branding of being "gay", he decided to do everything the blackmailer demanded of him and basically became a sex slave. Got raped repeatedly and gang banged even well after his service was finished.
It really broke my heart.
The ML found out and deeply regrets everything he's done to the MC when they met again bc he's no different from the rapists. I really feel for both of them

Guys. Without spoiling too much, let this one marinate a bit. It's a lot heavier of a theme than you'd think. It's actually well written but the silliness and misunderstanding makes it lighthearted for now, until shit hits the fan. And no, the problem isn't the seme although he will do some questionable and regrettable things, he's not truly the problem here.
The circumstances were quite unfortunate for the MC. that's all I can say..be prepared with tissues