To escape an arranged marriage in the Dragon Palace, Kim Yong-man, the dragon king's daughter, flees to the human world and begins high school, determined to become the top of her class. There, she encounters Shim Hae-soo, the current number one student sitting beside her. As rivalry shifts into friendship, the two gradually become special to each other.

He rejected him once. Now they’re roommates—and fake boyfriends for a month. What could possibly go wrong?

Kim Yongman, the daughter of the Dragon King, escapes from the Dragon Palace and flees to the human world to avoid an arranged marriage. Determined to succeed, she enrolls in high school with one clear goal: to become the top student in her class. But the current number-one student, Shim Haesu—who happens to sit right next to her—doesn’t seem too happy about the arrival of a new rival… Even though they’re both far too busy focusing on their studies, the two somehow keep getting tangled up with each other!

When a demonic uprising threatens to end the world as they know it, a monk and an excommunicated priest join forces to protect a powerful young boy and the next generation of magic. As dark forces close in, the unlikely trio must confront their inner demons.

After summer vacation, So-ri transfers to a new school and finds an anonymous letter in her desk drawer with an introduction to the school and a clue to finding the next letter. "If you want to keep reading, find my second letter!" While following the clues in the letters and searching all over the school like on a treasure hunt, So-ri keeps running into a same-aged student named Dong-soon. So-ri and Dong-soon quickly become friends as they search for the letters together. As she finds one letter after another, the special connection continues, and So-ri's curiosity grows for the mysterious sender. "I want to find the last letter and thank you in person."

Choo Sang-woo, a Computer Science major, is a stickler for principles and the embodiment of rule compliance. The encounter between two individuals, one with a mind for engineering and the other for the arts, whose personalities don’t overlap in the slightest, continues relentlessly – whether by coincidence or fate. And somehow, despite everything, they are creating a mobile game together?! The bright red semantic error, Jang Jae-young, shakes Sang-woo's perfect world! Will he be able to debug this error?

Traumatized by his past, Ohn has shut his heart off to other men. Into his quiet life, twin brothers Seo-woo and Jae-woo suddenly appear. Unable to confess his long-held feelings, Seo-woo desperately asks his twin, Jae-woo, to approach Ra Ohn in his place. Jae-woo initially agrees out of reluctance. However, as he spends more time by Ohn's side, he finds himself naturally drawn to him. Meanwhile, Ohn slowly begins to sense that, behind their identical faces, lies a completely different warmth. Caught between two men, Ohn's heart begins to waver—When he stops seeing double, who will be the one to unlock his heart?

Sales Team 3 is made the scapegoat for the chairman's embezzlement scandal. The team leader attempts to reveal the truth, but the manipulation of evidence by a key executive pushes the entire team to the brink of collective dismissal.