With help from a young woman with synesthesia, a cop who lost his sense of pain tracks down the serial killer who brought tragedy to both their lives.
Starring Park Yoo-chun, Shin Sae-kyeong, Namkoong Min, Yoon Jin-seo, Song Jong-ho, Lee Won-jong, Choi Tae-joon, Jo Hee-bong, Kim So-hyun, Yu Jae-seok