Yun Wuji, who possesses the unique skill of "watching the situation", was ordered by his teacher to step into the Central Plains to investigate the mystery of the reappearance of the "Seven Spirits in the World". As a newbie in the world, he made his mark in the murder case of the Jiangnan Escort Bureau by virtue of his special skills. He rescued the female swordsman Su Lan and obtained the first fragment and the first love.
As he pursues the scattered fragments, Yun Wuji gathers core partners: the ranger Xie Zhiqiu and the medical girl Lianxing. In the form of a unit drama, the three of them solved strange cases and made friends with heroes in different rivers and lakes, such as restaurants, gambling houses, and border areas. Friendship and love become deeper and deeper in the process, but Yun Wuji also gradually realizes that the clues of each fragment subtly point to his late master.
When the team collected the six fragments and got closer to the truth, they encountered the most tragic betrayal. Yun Wuji discovered that his most trusted friend, Xie Zhiqiu, was actually the parent and son of the leader of the "Destiny Alliance", and that all his contacts were for manipulation. At the same time, Yun Wuji, by "observing the situation" of the clues related to all the fragments, was shocked to deduce that the last seventh fragment was actually sealed in his own body - he himself was the last and most important "key" left by the master.
