Pei Cijing, a modern salted fish, travels through ancient times. He is bound to the melon-eating system and just wants to lie down and fish. Unexpectedly, a marriage exchange allows him to marry Shen Ninghuan, a talented woman who can listen to people's voices. Forced to take part in the imperial examination under the sweet attack of his wife, he solved the case by eating melons in a fancy way, and accidentally discovered that the ninth prince was a girl. The young couple teamed up to make trouble and spread the sweets. The whole process was full of jokes and jokes.