Lee Ji-Su

A wolf in sheep's clothing. Ji-Su works as an intern in the supernatural investigation department with Ezra. He disguises himself as a human with exceptional clairvoyance and hides his demon nature. However, he lives a double life and is the orchestrator of several strings of murders, most of which turned into cold cases. Those that did not are usually pinned onto someone else. He does not commit the murders, but instead acts as a pupper master who coerce others into doing the dirty work for him. Ji-su does so without revealing his true identity, so even though some of the criminals are caught, they'll be unable to trace the crime back to Ji-Su.