During a mission, Ning Yu was dragged into the bottom of a river by a man in white hired by criminals, and accidentally traveled through time and became the third prince... Ning Yu experienced many embarrassing moments as he explored the world alone. Fortunately, he met his former attending doctor Shi Qi by chance, only to discover that Shi Qi was his own imperial uncle? !
After solving cases again and again, the two actually "uncovered" the huge secret of the world. Shi Qi found the murderer of his parents because of this secret. Moreover, this murderer provokes murders at will in this world. For the power and money in his hands, he even uses his daughter as a knife to stab his daughter's lover and friends. In the end, Shi Ning and the two of them joined forces to kill the man. From then on, the world was peaceful and they returned to their original world.
However, Ning Yu discovered after investigation that the person who dragged him down to the bottom of the river was actually Shi Qi, and Shi Qi was one of the murderers who helped the suspect commit the crime. Morality and friendship pulled Ning Yu back and forth. In the end, he chose to let Shi Qi "escape", but he himself blamed himself for his moral decline. In the end, he resigned voluntarily and committed suicide at home. After Shi Qi discovered Ning Yu's body, he held him and cried all night. The next day, Shi Qi took Ning Yu's ashes and jumped into the river that they had crossed.
Purpose: The choice between love and law