Chen Yu starts going over all the cases from three years ago and learns about a drug dealer who might know Wu Zhen Feng. He learns that Wu Zhen Feng was saved by Mengka. Chen Yu learns that Du Shan had a boss and that Wu Zhen Feng is back for revenge. Wu Zhen Feng learns about a drug dealer with a boxing ring who might know where to find Dong. Chen Yu learns about the details of the case three years ago. (Source: jindreame at MyDramaList)