Computer science major Sangwoo Choo values reason, routine, and rules above all, so when the rest of his teammates fail to contribute to the group presentation, he doesn't hesitate to cut everyone's names from the project entirely-including design major Jaeyoung Jang, which ruins his plans to graduate and study abroad. Jaeyoung is more than happy to return the favor and strives to be the biggest thorn in Sangwoo's side-but as they spend more time together, a strange attraction begins to develop between them... Will Sangwoo be able to debug this semantic error from his life?

Jieum Ban has a secret-she can remember the memories of her previous lives...all 18 of them! This means she retains past knowledge, skills, and most importantly, the bonds with the people she cares about. Guided by the bittersweet memories of her last life, Jieum sets out to rekindle the love that was cut short by her tragic death. But little did she know her biggest rival would be her own past self...

In a world where the top musicians possess magic, STAR ONE is just a powerless, run-of-the-mill, B-tier K-pop group at best. But when a sudden attack during a performance puts the five members' lives in danger, leader Soule unleashes powers of his own! Will this finally be the big break the group was hoping for?