Mirror Ghost: Two Ghosts Walk Together

Malevolent ghosts descend upon the world, their killings bound by cold, unyielding rules, and humanity survives in the eerie shadows. Zhang Wei, transported into this desperate world, unexpectedly gains control of the uncanny Mirror Ghost. As their fates intertwine, he meets Yang Jian, who teeters on the edge of collapse. Every ghost master is ultimately doomed to be devoured by the malevolent ghost within them and lose their humanity—a fate written in stone. But two people burdened with ghosts choose to anchor each other's humanity. The mirror realm hides deadly traps, the ghost mail delivers ominous messages, and one paranormal incident after another follows. They travel through lands of disaster, confronting the horrors that come one after another, trying to break the curse that dooms ghost masters to perish and rewrite the final ruin of all. — Description from novelcodex.org