Sexual coercion- getting someone to perform sexual acts through manipulation and/or under threat of violence (in this case, the false threat of violence against Seonhwa… which is manipulation) is not consent- by legal definition. You can look it up.
The only time you could argue they had consensual sex was in the shower, when Nanjo initiated- but I’d argue that’s dub-con, since their relationship was still being defined by the “contract,” and so it’s likely Nanjo was still operating under the pretence that he *had* to have sex with Mokyeon- I.e. he wouldn’t willingly have chosen to meet up with Mokyeon that night otherwise

Bro’s acting like his wife of 10 years just left him and took the kids, when in reality the guy he was raping and abusing for a few months finally drew a hard line. He’s got some BIG delusions and I’m not actually convinced he ‘loves’ Nanjo, because he’s STILL not respecting Nanjo’s boundaries and space. It’s plain obsession.