Lin Xiaoyang, a 25-year-old delivery boy, received a strange order delivered to "No. 444 Huangquan Road" late at night on the 30th day of continuous overtime delivery. When he bravely delivered the goods, he found that the recipient was actually Hei Wuchang, the director of the Underworld Office in the Human World. Due to the accidental reincarnation of his former "yin and yang courier", the underworld was in urgent need of temporary workers. Lin Xiaoyang was forced to sign a "temporary yin and yang contract" and became a special delivery person connecting the yin and yang worlds.
