Yeonjudong Ilgajog Sal-Insageon

Kwon Seong-chan, an ordinary high school senior who wants to become a profiler. After graduating from high school, he announced that he would not go to college, causing a great conflict with his parents. One rainy night while leaving school late and staying cool with his family, an incident occurs in Sung-chan's house where his family is murdered, and Sung-chan holds a weapon in his hand. Seong-chan, who is caught right away at the scene, clears himself of false charges and traces the traces of his family to uncover the truth behind his murder....

(Source: Naver; translated)