Cruel City) is a 2013 South Korean television series starring Jung Kyung-ho, Nam Gyu-ri and Lee Jae-yoon.

This noir/crime drama revolves around the love and struggles of undercover agents and members of the nation's largest drug ring.

When Lee Kyung-mi (Go Na-eun) is murdered by drug lords, her mentee and friend Yoon Soo-min (Nam Gyu-ri) is recruited by Kyung-mi's boyfriend (Lee Jae-yoon) to try and catch the prime suspect, a mysterious figure only known as "The Doctor's Son" (Jung Kyung-ho).

Working under the orders of police director Min Hong Ki (Son Chang-Min), The Doctor's Son works to take down the Busan drug ring and seek revenge against the dealers who were responsible for his mother's drug addiction.

However, she ends up falling for The Doctor's Son, the drug lord Kyung-mi was investigating until her untimely death.

The soundtrack digital single "Hurt" was sung by Kim Yong-jin of pop group Bohemian.