Reunified Korea, 2020, Border Special Investigation team leader Yun Suk’s son is kidnapped. His team and he raid the kidnappers’ hideout only to find out that they were actually shooting at Yun’s son.
Yun’s son, Hanbyul doesn’t die but falls into a comatose.
One year later, old scientists’ bodies keep turning up on the border area every three months with the same necklace that was on Hanbyul on them. Guilty and vengeful, Yun takes up the case.