A story of love and friendship between five high school students from Seoyeon High School. Lee Ha-Min (Seo Ji-Hoon) appears like a bright person, but there is also darkness within his mind. Han So-Mang ( So Ju-Yeon) is a warm-hearted person, but she is also quite timid. Lee Jae-Min (Kim Min-Kyu) is a popular student with a painful past. He is kind to everyone around him. Yoon Bo-Mi (Kang Hye-Won) is a sweet, model student. Choi Jin-Young (Yoon Hyun-Soo) loves playing games. He can seem unfriendly and has a delicate personality.

A boy falls to his death at school, but Ok Chan-mi does not believe that her twin brother, Park Won-seok, committed suicide. Chan-mi transfers to her brother's school, Yongtan High, and meets Ji Soo-heon, who witnessed her brother's death. A "hero," who avenges bullied students, appears at Yongtan High. Chan-mi speculates that it may be connected to her brother and starts looking for this hero.

The story of 18-year old students who have to battle the discrimination at their school in order to have a future.

A male student's body is found at school. Authorities assume that the student killed himself in a fall. Other students at the school hold a trial to uncover the truth behind his death.

A girl dreaming about becoming a webtoon artist. In order to find material, she approaches an archery club full of good-looking boys by becoming the team's manager.

Adapted from the webtoon series "Welcome", this TV series tells the story of graphic designer Kim Sol Ah who brings home a cat, unaware that the animal can turn into a human being.

A king makes a request to Joseon's best dating agency "Flower Crew" to protect his first love. Upon his request, the matchmakers at the agency risk their own lives to transform the lowly woman Gae Ddong into the most noble woman.

A man named Shin Woo regrets letting his first love go ten years ago because he didn't have the courage to confess. However, he gets the chance to win her again when he travels back in time...