According to legend, there is a ghost world in which there is a mountain, a big peach tree on the mountain and a golden rooster on the treetop. Whenever the golden rooster crows in the morning, ghosts who wander out at night will rush back to the ghost land. If the ghost does something unnatural at night, shentu and Yulei will immediately find it, catch it and feed it to the tiger. Therefore, all the ghosts in the world are afraid of shentu and Yulei. Therefore, folks draw shentu and Yulei on red paper symbolizing happiness and good fortune, and stick them on both sides of doors and windows during the Spring Festival to express people's good wishes for good fortune in the coming year. It is said that if two door gods are attached to the gate, all monsters will be afraid.
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