My New Partner 2008 on netflix

Young-joon, a fresh prosecutor, takes a big affair to leave for Busan and unwillingly gets cooperation from his father, Min-ho who is a veteran detective who deserted his family at one time. Since then, they are living separately without keeping touch each other for years. Now that their destiny to trace the same host of the accident related with a big drug trade gives the father and son a chance to recover their affection over the long time.