The day of graduation

When one school teacher gets the other fired, he is challenged to an after-school fight.

When Mi-so and Ha-eun first meet in childhood, their lives become instantly intertwined, forming a bond surrounded by happiness and naivety. But as adulthood arrives, alone and together, they are forced to deal with sadness, anger, grief, growth, and most of all, love.

After his first date at age 15 ended with the girl making out with another man at a party, aspiring writer Lester Grimm has treated all his girlfriends with jealousy and suspicion. While dating Ramona Ray, paranoia gets the best of him when he discovers that her most recent ex is successful novelist Dashiell Frank. Lester begins attending the same group therapy sessions as Dashiell to learn about Ramona's past with him.

When they were young, Min-joo and Seo-yeon cared for each other and were closer than brothers and sisters. However, she accidentally learns about Seo-yeon's tutor, Woo-hyeon, and because of this man, their 10-year friendship starts to become shaky. Meanwhile, Jeong-soo is hurt in seeing Min-joo like that, and so he distanced himself from Min-joo. Because of Min-joo and Seo-yeon's misunderstanding, Jeong-soo who couldn't care much might just leave so Min-joo tries to break up with the help of Seo-yeon. While in the process of breaking up, Min-joo and Seo-yeon went back to their close relationship. The love of women who have been separated because of man, and the two men's friendship is comically drawn.

A group of close friends who attend a private school all have a debilitating crush on the sunny star pupil, Sun-ah. The only member of the group who claims not to is Jin-woo, but he ends up loving her as well.

A pair of former high school sweethearts reunite after many years when they return to visit their small hometown.