Intern Ghost Assistant: The Demon King is Good at Flirting.

Summary

A young protagonist recounts a mission where they met Brother Cheng, a small gang leader. Initially skeptical, they developed a friendship during a complex underworld challenge designed to eliminate participants. Successfully completing the mission, the protagonist joined the Ghost Legion and found happiness with their master, mistress, and Sister Mu. They transformed from a frail individual to a content, chubby person dedicated to punishing evil ghosts and spreading love, remembering their last meaningful encounter with Brother Cheng in a back garden.

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