Born bully, Kim Chang-sik, while cleaning everything up to live a normal life again, he meets a sad girl, Kim So-hee. A story where Kim Chang-sik had no choice but to participate in So-hee's situation, more than his own.

The secret society of contract killers falls into chaos, unleashing a new breed of assassins. With old rules in ruins, who dares claim the shadows?

A girl wakes up in a huge secret laboratory, then accidentally meets another girl who is trying to protect her house from a gang. The mystery girl overthrows the gang with her unexpected powers, and laboratory staff set out to find her.

In 1933, when Korea was under Japanese occupation, five people in Gyeongseong are suspected to be "Phantom" spies of the anti-Japanese organization.