Observe Three Times and Don't Dig, Cultivate Five Things and Don't Touch Them.

Lao Guai posed a problem to Chen Yan, asking him to repair the cave dwelling next to his ancestral home that was about to collapse within three days using the old method of a craftsman. If he couldn't repair it, he would leave. Chen Yan began to study his grandfather's notes, learn the "Three Watches and Five Don't Dig" formula, and understand the essence of Yinjiang's craft. He built the kiln according to the method he had written down. When he encountered the problem of soil falling off the kiln wall, he remembered his grandfather's advice on "complying with the soil" and adjusted the mud ratio and the intensity of tamped soil. He successfully built the kiln and passed the test. Later, Laoguai taught Chen Yan the true craftsmanship of a blacksmith. When Chen Yan was living in his ancestral home, he heard strange digging sounds in the cellar. He used a flashlight to find new soil and small holes in the corners of the cellar.