Behind the scenes of modern society exists a massive mafia organization, Athanasia. Athanasia holds immense influence in the underworld, controlling information, funds, connections, and military power.

Guest and Yun are rookies. They were paired up because they were recruited on the same day. If problems arise during missions or daily life, they face joint responsibility as a pair. The partnership will be dissolved once they become fully fledged members.

The frail and unreliable Yun uses a lovely smile to push his work onto Guest. That adorable behavior is entirely a calculated act.