C557 Accident
Actually, for Chen Hui, being able to find out who the real culprit was didn't make much of a difference, because Chen Hui wasn't an innocent person. Even if he did make a move, it must have been under a situation where the evidence was solid, which meant that he had already determined who the culprit was.
Chen Hui would now think this way, from the point of view of protecting Su Xiaoya