
I want to go ahead and point out that people can't always control how they react during sex. Just because he was responding or moaning doesn't count for consent. Bum sees Sangwoo as someone who is hurt and is unable to look past the things he has done to him because he has been conditioned to this kind of behavior through domestic abuse. "I like you" was another of Bum's attempts to reach out to Sangwoo. He's stuck thinking that loving him can save Sangwoo from what's eating away at him, even if it's futile and it just hurts him more. It's also not the first time Sangwoo has sexually assaulted Bum.
Not excusing any behavior or trying to say people don't have a right to be upset, I'm just saying.
Oh my god will you two learn how to communicate already