Haengnam going to the hospital. She wants to look good to her, so she looks at her stores and takes care of all her housework. She even got a job for you and worked hard for you today, but because of an unexpected variable, Haengnam quickly becomes an intellectually disabled person.

A high school girl, Heesun, and her friends go out to a club where they run into Donghun who is a friend of someone else also named Heesun. From that day on, she wishes to be closer to Donghun than the other Heesun is.

Aspiring writer Je-a unveils a shocking truth from the observations she makes of the fellow students at her high school where there is something akin to a caste system.

In his 40s, the stuntman Woo-seok wishes to go back to the prime of his life in 1997, before a facial scar ended his acting dreams. One day, he purchases five talismans from an unknown monk, hoping to change his life. However, during a film shoot, a car accident transports him back to his high school days in 1997. Now living as the high school student, he embarks on a project to revamp his past life, which was filled with a troublesome father, son, and husband.

Instead of repaying a debt, Jungsik is asked to kill Jaeyoung, a woman who seems to be in a similar situation to him. Jeongsik, who has never killed a person before, sees an opportunity to kill Jaeyoung, but it's not easy to follow through.

Upon helping her friend audition for their all-girls high school's production of Romeo & Juliet, freshman Sun-wha is unexpectedly cast as Juliet. To her surprise Romeo is played by the über-cool and stunning senior Ha-nam, whom all the girls seem to have a crush on. As the two would-be thespians grow closer, Ha-nam takes Sun-wha under her wing in more ways than one. However this sparks the jealousy of the play's director, Su-yeon, whom, it turns out, is more than friends with Ha-nam.

The politician Koo Myung-hui finds his wife in the garage. She is cleaning her son's bloodstained car, which has just run over a person.

Once a legendary detective and a new mom, Mi-young, now works a desk job. But when overenthusiastic newbie Ji-hye is assigned to Mi-young's civil complaints team, the two female cops get caught up in a serious criminal case that triggers an action-filled comedic investigation.

In the year 2020, a small number of Alien Research Club members gather in underground bunkers, having survived the invasion of yellow liquid aliens. Chaos ensues when an alien gets into the body of one of the members. And they realize everyone will die if they don't find and kill the alien within 30 minutes. Can these last survivors finally be safe in the face of the alien invasion?