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Kyung-chul is a dangerous psychopath who kills for pleasure. Soo-hyeon, a top-secret agent, decides to track down the murderer himself. He promises himself that he will do everything in his power to take vengeance against the killer, even if it means that he must become a monster himself.
After they lost their parents in a traffic accident, strange events begin to happen to Yeonhui and Yeonsu.
There are five lonely souls: Je-hwi, who hides himself from the world. Jang-hui, who is obsessed with certificates of qualification; Byeong-cheol, who believes that he has a fatal disease; and the lovers, Pyo and Romi. One day, a woman who committed suicide suddenly appears before them.
One day, Hyun-joon, a policeman who lives with his mother and his daughter, attains a superpower after getting struck by the lightning. After the incident, Hyun-joon realizes that there are others who have been going through the same situation with him, and gets involved with unexpected situations. Will he be able to succeed both, as a father who struggles with the relationship with his daughter, and as a cop with a superpower who is eager to catch an evil criminal?
