Jin-wook, a runaway teen, enters a juvenile detention center and meets two other youths, Kalkuri and Saeksi. Jin-wook discovers that Kalkuri was the one who hired the killer of his father. After his release from the center, he investigates the case. President Jang, the head of the company where Jin-wook's father worked, was a spy. He murdered Jin-wook's father when he discovered this truth. As Jin-wook pursues the case, President Jang and Kalkuri attempt to cover up the matter. Meanwhile, Jeong-ah, President Jang's daughter, accidentally learns of her father's secret and decides to convince him to surrender. While helping Jin-wook, she falls in love with him. Upon learning this, Kalkuri tries to kill Jin-wook but is killed instead. Finally, President Jang and Jin-wook are arrested.