Warm on a Cold Night Episode 13

Due to Han Zheng’s growing jealousy and Jiu Er’s constant attempts to flatter the men in the investigations to gain more clues, they decide to split up, each following their suspicions on who the murderer is. Han Zheng’s lead reaches a dead end, so he reunites with Jiu and the rest of the team. The relationship between each new murder and the paintings grows stronger, but the identity of the murderer remains obscure. (Source: frankly at MyDramaList)