1999— The Age of Apocalypse, where violence was rampant. In those days, nothing was easy. A story about the love and friendship of girls, which was hotter than any other summer... Joo-young and Ye-ji’s relationship is tender but ultimately feels like an impossible one.

On the day that underground rapper Hak-soo fails his 7th audition, he receives a call from his hometown that his father is in the hospital. But he finds out that it was his father's plot to bring him to Byeon-san. To top it all, he is suspected as a phishing scam criminal and locked up in this small, boring suburb.

Renowned singer-songwriter Hyun-sik is admitted to a hospital when he is diagnosed with cancer. There, he encounters a young fan of his former bandmate Jae-ha, triggering a flood of memories about the years past.

Ever since her son died, Yeonok spends her time playing her son’s favorite game. She has forgotten how to interact with people or express her affection and goodwill. The lonelier she gets, the more burdensome she becomes to those around her.

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.

So-eun is a high-school girl living in the countryside. She’s skinny and quite bad at basketball, but she really likes basketball. The problem is that her school doesn’t have enough players for a team, and they’re trying to dismiss the basketball team. So-eun doesn’t have anybody to share her frustration. Then one day, Yu-jin, a washed up movie actress, and Yong-sik, Yu-jin’s fan who also goes to the same school as So-eun, appear in So-eun’s life. Now, So-eun’s time starts to run quite differently from before.

Seon-hee is a high school girl who used to tell lies to get her friends attention. She leaves Seoul guilt-ridden when her friend Jung-mi kills herself because of Seon-hee's lies. In the countryside where no one knows her, Seon-hee begins a new life as Seul-ki.

14-year-old Eun-hee moves through life like a hummingbird searching for a taste of sweetness wherever she may find it. Ignored by her parents and abused by her brother, she finds her escape by roaming the neighborhood with her best friend, going on adventures, and exploring young love.

Sulan, who works in a factory in the summer of 1978, begins learning photos with other female workers from Seok-yoon, the owner of the photo studio across from the factory. Seok-yoon, who had been closed, began to open his heart to female workers, but began to feel uneasy about the female workers' labor movement.

A phone has fallen in love with his owner. But she does not live as he wishes. He is confused, but continues to love her.