C24 The Interrogation of the Blood Letter

If it wasn't for Han Yuchen, why would the murderer drag Han Yuchen into this? Was it the scapegoat he found? No, with Han Yuchen's identity and status, it wasn't easy to plot against someone who wanted him to become the scapegoat. Why would the murderer choose such a troublesome path? She felt that she still could not figure out the motive of the murderer