Kim Hyeon-soo

The story of a woman who strives to achieve her goal of entering high society by becoming the "queen" in the 100th floor penthouse in Gangnam, the pinnacle of success in her eyes. (imdb)

Eun-Hee has lost her memories of her high school students days. She begins to work as the vice-principal for the high school where she graduated from. Since she began to work there, she experiences unknown phantasms and auditory hallucinations. Meanwhile, Ha-Young is a victim of school bullying. But she is driven into a trouble maker at the school. One day, Ha-Young happens to go to a closed bathroom at the school and she hears a ghost’s sound. There she faces Eun-Hee. (asianwiki.com)

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. (imdb)

Joo-hyeop is a serial killer living in the countryside, hiding his identity. When his son befriends a girl who is the only person who knows his true identity, Joo-hyeop decides to kill her for the sake of himself and his son.

Kang In-ho (Gong Yoo) is the new arts teacher at the Benevolence Academy in the fictional city of Mujin, North Jeolla. He has a dark past - his wife was a high school student who committed suicide and his daughter is under the care of his mother. In-ho is hired to teach deaf and dumb students in school but he soon discovers a dark secret that lurks among the students and the faculty. (Wikipedia)