Hello Monster

Genius profiler Lee Hyun, returns home to Korea after something from a case he’s been sent triggers a memory he thought he’d lost forever. Unbeknownst to him, one of his team members, Detective Cha Ji An, has been investigating him for some time. She is aware that his father was murdered and his brother disappeared under mysterious circumstances involving a criminal named Lee Joon Young -- whom they both want found and incarcerated. Each seeks to unravel the other, unaware that they’ve been drawn into a dangerous game of cat and mouse by a master player and that both truth and evil are closer and far more twisted than they think.

Synopsis: MyDramaList