Secret Reunion (Hangul: 의형제; hanja: 義兄弟; RR: Uihyeongje; lit. "Sworn Brothers" or "Blood Brothers") is a 2010 South Korean spy thriller film directed by Jang Hoon, and one of the highest grossing Korean films of 2010.The story follows Song Kang-ho as Agent Lee Han-gyoo of the National Intelligence Service (NIS) who falls from grace after failing to stop the assassination of a North Korean dissident.