beta
I haven't read the novel so I'm speaking out of ignorance but I get the feeling that In Seob has given in because it doesn't matter what he says to Woo Yeon, the guy interprets it as In Seob wanting to be fucked. So since he has to deal with being raped, he prefers to do it in the "safety" of their home rather than in the discomfort of the street/car with the anxiety of risking getting caught. It's just my humble opinion ╥﹏╥