Five She-Ghosts Chase to Spoil Me

To raise money for his girlfriend's medical treatment, Lin Nan agrees to a ghost marriage with five female spirits. However, he is betrayed by his girlfriend and her accomplice, and accidentally transmigrates into a bizarre world where he awakens a "Worker System." He refuses the "easy meal" offered by the female spirits and insists on growing stronger through honest work. From being a waiter, a security guard, to a butler, he completes missions in one horror dungeon after another, steadily building up his power.