I deleted my previous comment to outright say it IS rape, Woo Won repeatedly saying "Stop", Seo an saying "I thought you liked shoving it in me" indicates that Woo Won does not want to do that right now, hence no consent being used. "I'm not listening to you today" is also an indicator that no matter how much Woo won said "Stop", Seo an will not listen. We can clearly see Woo won is distressed during the sexual intercourse, that should NOT happen at all. Seo an saying "Then get it up" to Woo won is also a way of forcing him to have sex, despite Woo won wanting to stop. Woo won not answering to Seo an's "I thought you liked this" but Seo an continued anyway despite it. Everything about this screams non consexual. Do I really need to spell it all out like this?