It’s not a 360. Woori has been shown to manipulate mc and take advantage of his naivety to have sex with him as well. The fact he even said “friends help each other out” and proceeded to do the sexual acts, is manipulation. The hints were there, you were just blinded by his puppy demeanor.
imo the author made this 360 with woori's character bc the ML sucks and is not appealing enough lmao