The Lure from Ex-husband

At the age of fifteen, Liu Xixi's half-sister was hit by a car when she was going to save Liu Xixi, and she became a vegetable in the accident. From then on, Liu Xixi lived in guilt. But his sister's fiancé, Shen Jingchen, treated her with the same friendliness as before, as if he didn't blame her at all.
One day a few years later, the headline in the news was: The Liu Family's Second Miss turned her sister into a vegetable and robbed her fiance. 
All of this was due to Shen Mo Chen's arrangements! He had always suspected that the accident had been arranged by Liuxi. For the past few years, he had never forgiven her, and now, he was going to ruin her reputation even more. He was going to marry her and torture her to death every day. However, every time he tortured her, why would there be a faint trace of pain in his heart? Why did he subconsciously want to protect her? Would she let herself be tormented?