특별수사: 사형수의 편지

The name of this movie is 특별수사: 사형수의 편지 released in 2016-05-19 and it's main theme is A disgraced ex-cop, seeking revenge on his treacherous ex-partner, sticks his nose into a high-profile murder case. But in the process, he finds himself in conflict with much more powerful and dangerous forces..