Master of the Mirror Realm: I Kill Ghosts and Become Gods in Both Realms

[Modern + System + Oriental Fairy + Invincible Growth] When he woke up, Qin Yuan found that he had traveled through an ancient mirror to the world of "Zombie Taoist Priest" and became Uncle Jiu's closed disciple! Learning spells, slaying ghosts, slaying zombies... I thought it was just an adventure, but who would have thought that after returning to the human world, the underworld gradually overlaps with reality! Evil ghosts are rampant and the underworld is invading. He will use the system as a blade to kill through the three realms and become the supreme master!