Choi Dae Hoon

Although Baek Hui Seong is hiding a dark secret surrounding his true identity, he has established a happy family life and a successful career. He is a loving husband and a doting father to his young daughter. But his perfect façade begins to crumble when his wife, Cha Ji Won, a homicide detective, begins investigating a string of serial murders from 15 years ago. Ji Won notices changes in Hui Seong’s behavior and begins to wonder if he could possibly be hiding something from her. (Source: MyDramaList)

In defiance of her family’s opposition, Song Ah gets accepted to the music school of the same university where she originally majored in business. As she’s seven years older than her classmates, she finds her new academic life daunting and struggles to find strength. One day, she hears Joon Young playing “Träumerei," which comforts her. Joon Young is a talented pianist who started playing the piano when he was six. He’s been friends with Jung Kyung, the granddaughter of Kyunghoo Group’s CEO, for a long time, and is in love with her. When he decides to keep his distance from Jung Kyung, he meets Song Ah. (Source: Viki)

A sexual scandal between a math teacher and a student in a prestigious high school ends in tragedy. Four years later, they meet again, now both adults, to reveal the corruption in school and to regain one's reputation as a teacher. Ji Yoon Soo is a high school math teacher with a bright smile and a positive impression of others. She is a hard-nosed and stubborn person who has to push ahead with the decisions she has made. She is a math geek who loves solving difficult problems and teaches students to purely love math. Baek Seung Yoo is emotionless and has no light in his eyes. He used to be a math genius who appeared on a quiz program at the age of five and surprised the world by solving college-level math problems. He was admitted to MIT at the age of 10 but dropped out at the age of 12, and suddenly disappeared. (Source: CJ ENM)