Chen Yun suffered persecution from villains and accidentally was reborn as a black donkey, awakening a guardian golden finger. He turned into a spiritual donkey to secretly guard his widowed sister-in-law who was in a difficult situation, relying on special abilities to resolve crises time and time again and finding rare medicinal herbs to improve life. After experiencing life-and-death tests, he finally recovered his human body, and the two joined hands to engage in the herb business, fighting all the way against local ruffians and business rivals, getting through heavy dangers of business wars and kidnappings. Mutual understanding and cherishing grew in hardships, breaking through rumors and obstacles, defeating all opponents, unraveling past knots in their hearts, and reaping a happy ending of moving toward each other in both directions.