HA Yoon-ju becomes the newest member to a unit within the Korean Police Forces Special Crime Department that specializes in surveillance activities on high profile criminals. She teams up with HWANG Sang-Jun, the veteran leader of the unit, and tries to track down James who is the cold-hearted leader of an armed criminal organization.

Set in a village right after the Korean War, poor but good-hearted Heo Sam-gwan sets out to win the most beautiful girl in the village, Heo Ok-ran, by selling his blood to earn money. Years later, the two are happily married with three children, but their family undergoes a crisis when Sam-gwan’s eldest son doesn’t resemble him and rumors spread about the boy’s paternity.