Twenty-six corpses were hung on the street. Song Ci and his female assistant Yu Mo made an in-depth investigation. Song Ci consulted his teacher Geng Zhinian. Unexpectedly, the 26 corpses caught fire spontaneously that day. Song Ci thinks it might have something to do with Geng Zhinian who was in charge of the Boxun Sect Case back then. Geng Zhinian sets a plot and knocks Song Ci out, trying to sacrifice him to the Demon King Boxun. It turns out that Geng Zhinian is the leader of the Boxun Sect. At the beginning of the ceremony, Yu Mo comes with some helpers, but Geng Zhinian burns himself to death. So there must be someone behind him. Song Ci sets a trap to draw the snake out of its hole and it's actually Yu Mo. Eventually, Yu Mo dies in the arms of Song Ci, and Song Ci found that Yu Mo's father is the real murder.