Yin Yang Delivery Boy: the System Forces Me to Solve the Murder Case

Li Goudan, a poor delivery boy who couldn't even pay the rent, was suddenly bound to the "Yin Yang Delivery System" one day - the order he took was not to deliver three meals to the living, but to deliver ribs to a haunted house and fried liver to a morgue. The customers were all deceased with unresolved obsessions. The system said: If you cannot complete the task, you will deduct Yang Qi. If you deduct all the Yang Qi, you will die.