Teenage hormones are difficult to be restrained. High school senior, Jayo is seduced into his first sexual experience by classmate Hara, who eventually kills herself when he ignores her. Since then, he immerses himself in loveless sex until he meets cheerful nurse, Namok. Meanwhile, his pal Seuin has developed a crush on his teacher, which is socially taboo. PLUM is a tender coming of age story about two teenage boys who embrace growing pains in a hard way.
Ji-Hwan (Kwon Sang-Woo) and Dal-Rae (Kim Ha-Neul) are old friends and they have grown up in the same neighborhood. Ji-Hwan admires Hong Kong movie star "Jacky Chan" and wants to be a world action star. Dal-Rae has a desire to be an actress. They always bear grudges against each other with their private weak parts, and they quarrel everyday, however they are great friends who care for each other. One day, Dal-Rae goes out with Young-Hoon who is in the same Taekwondo group as Ji-Hwan. Young-Hoon is a student representative of the department as well as an all-round athlete. Ji-hwan is also dating a girl, Ji-Min, a gorgeous glamour girl who has a well-shaped figure. It seems that there would be no problem between the good friends Ji-Hwan and Dal-Rae, but somehow a strange atmosphere arises after they start seeing someone else. Everybody knows it is more than just a friendship, except Ji-Hwan and Dal-Rae.
Jung-Hee (Kim Hye-Na) is a 21-year-old dancer who struggles with insecurities and other problems after her father abandoned her family 15 years ago. One day, Jung-Hee's brings back their father. Keun-Woo (Lee Sang-Woo) is a 25-year-old low level telephone technician. One day, his friend shows him a picture of a woman he is trying to extort money from. The woman is having an affair with a married man. Keun-Woo taps into the woman's telephone line and begins to eavesdrop on her conversations. After a few evenings, Keun-Woo falls in love with the woman, but the woman doesn't even know he exits. In-Ho (Kim Tae-Woo) is a 30-year-old soldier. He is about to be discharged from the military after serving for 2 years. In-Ho then gets his last leave of absence and decides to give his wife a surprise visit. When he arrives his wife isn't home. When he does finally see her his wife has changed and seems distant.
After spending 7 years as a man-servant in his fiancé's house, Young-bok gets kicked out of the place and works in Gyoung-sung station. He falls in love with Gye-soon but tragedy strikes her, which propels him to seek revenge. This is the oldest Korean film that has been preserved.