Dose he really can feel ma sangtae's fantasy or its his own illusion ?

Ch 9 should shed some lights to your confusion but...
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Yes, Jinwoo's sexy delusions are bcs he can "feel" Sangtae's fantasy. But I have to remind you, as you'd see in ch 9, Sangtae's fantasies are all subconscious resulted from his desire towards Jinwoo and his sadistic tendencies. He never purposefully projected his fantasy towards Jinwoo. I said again, they're all subconscious; it's just that Jinwoo being unlucky/cursed to be able to "feel" them.

Thanks god someone feels the same about sangtae

Right?! I'm sad that readers blindly hating on him without even understanding the situation. Yes he's the typical jerk but he never intended to hurt Jinwoo, he's just being immature in showing his love; it looked horible just bcs we see it thru Jinwoo's perspective who consider Sangtae as enemy. Like, people should read ch 17-18 and see how he actually cares a lot about Jinwoo（￣へ￣)

i love this comment