Lee Daeyeol, the new student of Woollim High, encounters with the most popular bully in school, feared by everyone in the school, Ko Hyun-kyung. They are so scared of her and some even faint even by mentioning her name only. Who wants to find trouble with her, think twice. She'll beat them back twice the pain despite being the sole bully in Woolim High. Daeyeol frequently got bullied by her but does not hold any sense of hatred towards her. He knows that there is something sweet and nice that

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Akaa Ageha, or better known by her stage name Saeki Nakayama, is the world's number one rookie ice skater increasing her popularity after her current win in the Olympics. After being challenged by her opponent, Viktorin Verkhoturov, in an upcoming competition. Saeki travels to Korea to meet with her idol, Kim Yuna, to practice with her for the upcoming Championship. During the stay, she meets with Viktorin's favourite boy group, Stray Kids. Jisung secretly develop feelings towards Saeki a

Somi is a runaway mermaid living on land for fifteen years. She transforms into a mermaid when she touches the water. She meets with Jihoon when her human cousin, Sungwoon, brings s to her luxurious bungalow. Jihoon secretly develop feelings and one day he discovers Somi's real identity. Dae-hyun wants to use her for his personal vision and Daniel slowly likes Somi as well. Between WANNA ONE members and Dae-hyun, who will win Somi's heart?

Hana have 120 days left to live. She transfers to a private school deep in the forest, learning what she really wants to learn, swordfighting. She meets with her classmate, Takada Kenta, who is the school's hearttrob and the expert of swordsfighting. He trains her everyday in order to prepare her first and last match against himself.

Vampires are facing an uncontrollable extinction when their kind could not find any other humans' blood that would not poison them. Sungyoon, known as Y and one of the members in one of the teenagers' pack, Golden Child, leaves the territory after he was blamed to have an affair with the vampire leader's daughter. He flies around the city of Seoul and found Da-hee, a positive and open-minded high school girl who is also sarcastic and a mere troublemaker. They meet and they get along, while br