The Chaser.

Although he was poor, detective Baek Hong Suk made an honest living. However, his poor yet happy family is shattered when his 15-year-old daughter dies. When people tarnish the name of his daughter, who means everything to him, Hong Suk vows to reveal the truth behind his daughter’s wrongful death and digs up the truth. In his search, he comes to face a stronger mastermind than expected.