"Doesn't 'Muscle Demon' just mean a demon who loves muscles?" ... Bai Ming went bankrupt because of a demon attack. To pay off his debts, he claimed that he was possessed by the Muscle Demon and joined the Demon Hunting Bureau. He planned to come clean about being human once he had paid off his debts, but after suffering a head injury during a mission and losing his memory, his coworkers reminded him of who he was: the Muscle Demon.
"The Lust Demon gives me three rewards a day, so I'm going to work out three times a day."
The one who owes you money is the human. What does that have to do with me, the Muscle Demon?
When an adorable junior who shared his feelings confessed to him, he showed no mercy: "Stay away from me! How can a frail human compare to the beauty of bulging muscles?"
A powerful demon tried to form a contract with him while he was badly injured and on the brink of death. He rejected it with disdain: "Get lost! I don't believe in any demon except muscles!"
At last, his superiors recognized his service to humanity in slaying demons and secured him citizenship and human rights. But then a real Muscle Demon appeared.
Bai Ming, who trains his body to the point of collapse every day: (⊙∀⊙)?
