Unless my memory fails to serve me, so far in the manhwa he went to her outta desperation, and she suggested getting married. And then he agreed and broke up with jungwon.
I think that's why people say he signed up for it.
Even went as far as to defend her to him when jungwon witnessed her degrading myungha, calling her my future wife or something. It's true he's cornered but i don't see why it's jungwons responsibility to shoulder the burden. Story could have had them be in cahoots against the lady too, only pretending to break up and stuff, but so far none of that has happened.
Abusive relationship don't just end as clean cut as that I wish they did. . And yeh that is a very common thing for the victims to defend the abusers and to even go back to them. Its honestly tragic
Can't speak for any other relationship but again, in this particular story, I personally feel he had the choice to refuse her offer in the beginning itself and talk it out with his partner.
He is a grown man after all, it's sad to see his desperation but it's sad to see the other innocent characters impacted as well.
Man or not he's a victim of abuse and I genuinely doubt he felt like he had a choice in the matter.
Idk how people r going "oh well he knows what he's getting into" when we know nothing about the progress of their relationship but I am certain like most abusive relationship there was build up to the abuse and when things got unbearable he was already isolated and dependent on her. Man is being a abused and u guys r saying welp that's was he signed up for like what the actual fuck