Ji Yanyuan accidentally bumped into her brother Zhi Zitan's brother Bai Moyi. He once scolded Bai Moyi for being a love-minded man and promised that he would never live and die for a woman, let alone be a mistress. However, he fell in love with her at first sight and even mistook her for his brother's girlfriend. Bai Moyi secretly posted on the Internet asking for help on how to avoid his brothers and successfully become a mistress. He also frantically speculated on Ji Yanyuan's every move, causing many ridiculous mistakes. After Ji Yanyuan discovered the truth, he deliberately teased him, and the two secretly fell in love and came together. Bai Moyi was always immersed in the "underground mistress" setting. In the end, the misunderstanding was solved, and Bai Moyi learned that the heroine was the brother's sister, and the two finally became an honest couple.
