The light body is having a violent reaction to the same thing as me. It's not good. Why is the light-body having such an intense reaction ? Cai Mingyu tells the light body that if he doesn't come back in three days, he'll never see his sister again. He's worried about her safety, and he's also worried about what will happen to her if he can't find her. He asks the light to come look for him alone at the valley. He says that if the light is unable to find her, he will never see her again. If he wants to save her, then it's better to protect someone than not be able to protect her. The light is so upset that he starts to cry. He wants to know what's wrong.