
Someone explain to me why Sangwoo was so rude to bum in the bed. Why was bum so talkative during the sex as well. Im hella confused/fucked up as usual.

Sangwoo is playing venerable by getting drunk, or maybe acting drunk. Bum feels more in control which is why he tries to get Sangwoo to suck him off. By sangwoo refusing to do so he's asserted himself back into the dominant role, foiling Bums attempt at taking advantage of him. Thus Sangwoo wins.

Really its kind of creepy, it shows that in a situation where Bum feels more in control and the person he is with is under the influence and more venerable hes willing to actually take advantage of the person. Just think of all the tings he'd had Sangwoo do if he was an ordinary guy who was just really drunk.
Sangwoo seems very off man idk. i have soo many questionss