剧情简介：The drama tells the story of a female protagonist who lost her beloved friend in a serial killer case, and after 19 years, she tracks down the case again and exposes the true face of the huge evil. Jin Ruiheng plays the role of Cheo Young-jin, a detective in the serious crime unit, who is a character with a sense of guilt and psychological shadow for not protecting his best friend. Ryu Deok-hwan plays Lee Sun-woo, a science teacher at Shinstar Middle School. He has been hurt as much as he has devoted his feelings to his students, even more deeply. Despite his intention to leave the teaching profession, he came to Shinstar Middle School, where his brother-in-law serves as the chairman, after being persuaded by those around him. There he meets warm and affectionate children.
