I Treat You as My Apprentice, but You Want To

I took on a useless disciple for three years. I fed him elixirs every day, improved his cultivation, and even spent a hundred years of Taoism to cleanse his muscles and marrow. But all he did was spend the whole day flirting with the green lady at the entrance of the village, and he couldn't even learn the most basic thing of introducing Qi into the body. Everyone in the school laughed at me for being blind and picking up a piece of rotten wood as a treasure. Until the day when Demon Lord led an army to surround the mountain and threatened to bloodbath the sect. My good-for-nothing disciple yawned and walked out of the mountain gate, and slapped the Demon Lord into the ground. He turned around and looked at me aggrievedly: "Master, can I marry Cuihua now?" Before I could recover from the shock, I heard his stomach growling. The villain pointed at the remnants of the Demon Lord who were escaping in the distance: "How about I catch a few more and bring them back to make soup for you to replenish your health?"