On the night of the workshop, a mystery woman jumps on SUNG-JIN while he’s asleep. But on the next day, everyone is acting like nothing has happened. “Just who was it?!”

College student Juwon has a hot girlfriend and everything else a guy could ask for. But when his childhood best friend cum first love, Nahee, moves into his boarding house and joins his college after years of no contact, Juwon finds himself in a sticky situation. Especially when she brings up the promise he made to her as a teenager: to let her, an aspiring artist, draw his hard on. Of course, Juwon tries to refuse, but Nahee is not one to be swayed by reason, and a man can hardly go back on his word, right? But things soon start getting stickier before Juwon realizes what’s happening…