White Clothes and Light Dust

He didn't care about anything, all he wanted was her, but he suddenly had an emergency. I thought I was destined to be separated forever, but unexpectedly I was reborn in another world... Without her, what's the point of being reborn? He was originally a ruthless person, but he stopped because of that smile and gradually sank. What should we do with him? This person doesn't have him in his heart...