The drama contains many cases which have unexpected twists and suspense. In every case, a paralegal, a police officer, a psychologist and a mysterious woman with the ability to predict the future will help solve difficult cases. Li Wen Jie is a paralegal with a sharp mind, and he is determined to find his long-lost sister, who turns out to be dead. While finding his long-lost sister, he met Feng Xu Zhi, who helped him with many things. Guo Yong Yan, a psychologist, met Zhao An Ni and helped each other in cases. Together, the four of them remain successful in solving cases until they realize a traitor among the four of them...