The Man from Nowhere (2010)

Taesik, a trained special agent, becomes a misfit after losing his wife in a horrible crash, and leads a bitter life in a thrift store. There are just a few clients and a neighbor called Somi, a little girl. After spending more and more time with Somi, he's going to be close to her. Then Somi is captured by a mob, and as Taesik seeks to save Somi by being deeply involved with the gang, his dark history is uncovered...