In order to track down the latest trends of her boyfriend who she has been with for two years but has suddenly changed her heart, Qian Qian went to great lengths to become a "detective". However, they gradually became familiar with each other through contact with each other. Who is the new love of my changed boyfriend? Can the gentle and steady Yi Jia, the simple and strong Qian Qian, and the trick of fate finally bring the two of them together?