Sang-woo is suffering from erectile dysfunction and premature ejaculation, because he is worn out from Ji-eun's strong sexual desires. Then, one day, Ji-eun sends him to a treatment center and the specialist is no other than his ex-girlfriend, Hye-ran. They bicker about past things, but in the end...
Seol-ah is having a small party to celebrate her 100th day with her boyfriend Do-jin. As the party went on, Seol-ah suddenly fainted and collapsed. Do-jin tampered the drink with a drug. Do-jin invites his friend Dong-joon to film him sexually harassing a dejected Seol-ah with a camcorder.
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With her mother's remarriage, Dong-jun lives in his stepfather's house while they are on honeymoon. However, on the first night of living in his stepfather's house, he witnessed his step-siblings, Seol-ah and Do-jin, having sex. Seol-ah and Do-jin are not brothers or sisters, but Dong-jun is...
