Tan Jingtian (played by Zhang Yao) and Jin Ling (played by Chu Yue) went to Thailand to participate in exchange and study, and got acquainted with Thai Sheriff Valarilo because of a female abuse and murder case caused by the smuggling of Indian national butterflies, and the three began to work together to solve strange cases. However, the crisis is all around them, and in the process of solving a serial murder case, it is discovered that Jin Ling has become the murderer's next target.