20-year-old Kyeong-soo is a man who s full of assumptions. He learned sex from Internet porn, but nothing the real thing. He s only had crushes and has never even kissed before. He got embarrassed when he confessed his feelings to Ji-yeon, his crush. He comforted himself from the shame with Japanese girls in his room with his right hand. One day, he has a fight with his father and remembers his friend Baek-hyeon had invited him over to Gangwon-do.
Is she a vampire? His friend s mom Hyeon-ok never ages! She s good looking enough to look in her 20s. Then one day, she spends a lonely night drinking on the beach and her son s friend starts to hit on her. Should she accept or not?
Is it love or a fling? Kyeong-soo is able to have sex several times a day. They do it at home, on the beach, in the water and again and again he s hard again. Hyeon-ok thinks Kyeong-soo is cute however, when his crush Ji-yeon comes down, Kyeong-soo starts to get confused. Does he love Hyeon-ok or was it just a fling?