A story that reveals the whole story of a friendship that has been changed over 20 years based on the death of a friend of Jang Jae-kyeong, an ace detective in a drug squad who is forcibly addicted to drugs.
Jang Jae Kyung is the Anhyun Police Station's Narcotics Unit's ace. One day, while pursuing drug dealers, Park Jun Seo, a friend who hasn't been in contact for 20 years, comes to visit him. The following day, Jun Seo's cold body is discovered, and Jae Kyung gets abducted and forced to become addicted to an unknown drug.