While researching for leads in the dismembered corpse case, Zhijie discovers that Zhizhi’s frequent point of contact is Jinhong. Jinhong becomes a prime suspect when his DNA matches the samples found at Zhizhi’s home. She subsequently discovers Jinhong has a twin brother Jinhua and it turns out that he knows Zhizhi as well. Zhijie is worried the case will turn complicated should both brothers have the same DNA.