The Secret Reunion (2010)

Years after he got fired for botching the arrest of a North Korean hit man and his protégé, Song (Dong-won Kang), former South Korean agent Lee (Kang-ho Song) hires Song, now exiled from the North, for freelance detective work. But both men are playing an angle -- Song wants to get back home, and Lee wants another shot at nabbing Song's old boss, the ruthless assassin Shadow (Gook-hwan Jeon). Hun Jang directs this tense thriller.