Possessed by Devil (19)

Liu Ze had always thought what he had done was foolproof, and that no one would notice anything out of the ordinary even if they were to re-examine the wound. 

After all, he had ruthlessly added an additional scar to himself after he had been wounded by the mysterious man, all for the sake of appearing more realistic when he placed the blame on Su Yu. 

Hence, the wound on the surface did, in fact, come from the fruit knife, and when Liu Ze used it to hurt himself, he had gloves on to ensure no fingerprints were left behind. 

By the time Su Yu walked through the door, out of instinct, he had automatically picked up the fruit knife, causing him to become the primary suspect. Needless to say, this was the unraveling of an evil masterplan.