It is said that Yan Xing visited Chen's house and found that the old man's body exuded an unusual smell, which actually slowed down the decay of the body. From this, she inferred that the old man had been dead for a long time. Later, Yan Xing stepped into Shi Ceku to look for clues. Unfortunately, Ji Fang Ming left first. (Source: Chinese = tvrili.com || Translation = unbeliebubble at MyDramaList)