Joon-soo learns that his friend Hee-gyu's sister Hee-jin has no where to go after being scammed, so he suggests living with him. The two start living together. They are close like brother and sister but they can never be that. The two start getting funny and Joon-soo can't go to sleep at the thought of Hee-jin sleeping just a wall away from him. Mi-na, Joon-soo's girlfriend notices Joon-soo changing and seduces Joon-soo at his house where Hee-jin is. Is it the girlfriend or the sister?
Cheating Notes
Joon-soo lets Hee-jin, his friend's sister, live with him when she gets into financial trouble after getting scammed.
Hee-jin gets a new boyfriend. They have sex, etc. Joon-so starts lusting on Hee-jin.
While their partners are passed-out drunk at their house, Joon-soo tries to screw Hee-jin (1:02:50). She rejects him.
Joon-soo and his girlfriend, Hee-jin and her new boyfriend, and Joon-soo's friend (the brother of Hee-jin), go to a bar where they get a private function room, where they can drink separately from other customers. Joon-so makes a sexual advance on Hee-jin in another unoccupied private function room and doesn't get rejected this time (1:21:45, 1:23:09). Hee-jin's drunk brother incorrectly enters the room and sees them banging on top of the table. When he enters the group's rented function room, he finds that Joon-soo's girlfriend and Hee-jin's boyfriend are also doing it on the couch, with Joon-soo's girlfriend riding Hee-jin's boyfriend.
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