A class of students stays at school for a camp in an elite study group to finesse theirs and the school's grades. Upon the first night, the swimming coach is found murdered. As the students try to figure out what happens, a voice informs them that if they don't figure the murder out, students will begin dying in quick succession.

Dong-hyun is a high school student. One day, he falls from the rooftop and bumps into Pan-soo who is a passerby. Pan-soo is a member of a criminal organization. When the two men wake up in the hospital, they discover that they have switched bodies.

Chinese secret agent Da-hee receives intel that a large number of illegal firearms are being smuggled into Korea and is sent to investigate the case. She meets Su-han, who is supposed to help her with the case, but due to his lackluster skills they fight over trivial things. But as their witnesses are suddenly murdered, the two of them quickly become the prime suspects.

Despite her disabled leg, the Ph.D. student Jae-yeon is a brilliant researcher with a rare ability to communicate with nature. Having been hurt by her hypocrite colleague and lover, she turns her back to the world and goes deep into the forest to live alone in a glass garden.

One idle summer night, three poor housemates, Jae-ho, Kyeong-soon, and Hong-chan order fried chicken with the money from the shattered piggy bank. When the food arrives, it is delivered by a large swine. A giant chicken soon follows, begging the 3 housemates that his fried chick is not to be eaten.