Based on the best-selling Japanese mystery novel by Keigo Higashino. When a man is killed, detective Dong-su (Han Suk-gyu) senses that it is related to a homicide case that occurred 14 years ago and starts spying on the past murder victim's son Yo-han (Ko Soo). Meanwhile, a young chaebol head asks his assistant to do a background check on his fiancee Mi-ho (Son Ye-jin). Mi-ho's mother had been the prime suspect in the case 14 years ago, and Si-yeong soon notices that Yo-han stalks Mi-ho like a shadow
(Source: http://www.koreatimes.co.kr)
