After missing the last train, he picks up a woman who is found muddied on the street and takes her to a karaoke booth with his senior. He tricks her into drinking an aphrodisiac, telling her it's a hangover cure. The woman is so into it that she doesn't get angry even when he plays obscene tricks on her, so he makes her give him a blow job in the karaoke booth, then takes her to a multi-tenant building and gives her a creampie threesome on the stairs. He then takes her home, washes the aphrodisiac down with alcohol, and then his younger brother joins in for a drug-induced foursome with continuous creampies. He orders the woman to leave, but the younger brother takes advantage of her lack of reaction and does whatever he wants at the hotel...