Modern city, parallel world. The social structure and technological level are basically the same as those in the real world, but there is a hidden setting: the global incidence of depression has surged to 30% in the past decade, especially concentrated at the top of society—the richer and more powerful people are, the higher the probability of depression. In the wealthy circles, political circles, military circles, and entertainment circles - depression has become "an invisible plague of the elite."
Traditional psychotherapy methods have limited effects and drugs have serious side effects. People are in urgent need of a new "healing method".
The protagonist Xu Letian was selected by the system during a rescue incident (rescuing a depressed rich man who jumped from the overpass). He accidentally obtained the "Source of Happiness System" and cured the depression of rich people, politicians, and soldiers by telling jokes. In repayment, the other party frantically gave away shares, resources, and money - just as he talked, he became the richest man.
