Detective K: Secret of the Virtuous Widow

Detective K Secret of the Virtuous Widow Hangul RRJoseon Myeongtamjeong Gakshituku Ggotui Bimil is a 2011 South Korean film based on the novel by Kim Takhwan, starring Kim Myungmin in the lead role. It was the 4th best selling Korean film of 2011.

When Detective K goes to question the jailed city governor, he discovers that the governor has just been murdered. Detective K then pulls out the murder weapon a long metal needle that is jammed into the back of the governors head. Furthermore, Detective K discovers a clue to the murderers identity. Remnants of the regional Wolfsbane flower are found near the long metal needle. But, while Detective K is holding the murder weapon, prison guards come into the cell and assume that Detective K murdered the city governor. Now imprisoned, Detective K awakes to find dog fancier Seopil Oh Dalsu standing over him. Seopil helps Detective K escape from prison.Because of this incident, King Jeongjo demotes Detective K and reassigns him to Jeokseong to investigate the case of a woman thought to have killed herself after the death of her husband. But, this reassignment is more of a rouse for Detective K to get to Jeokseong the area where the Wolfsbane flower blooms. ........

Source: Wikipedia