I Am the Crazy Villain's Sister Who Dies Young

I was the deranged villain's younger sister, destined to die young. Once my brother lost his brake, he went completely off the rails. To help the heroine find the two-yuan ring the hero had given her, he jumped into a river and nearly drowned. When she said she wanted an auction item, he spent his entire fortune to buy it for her, resorting to any means necessary to make money. He even willingly broke the law for her and became a wanted criminal. In the end, frightened by his madness, the heroine joined forces with the hero to have him executed on the spot at the border. My brother's madness made the hero and heroine's love and careers possible, while he rotted away at the border. When I opened my eyes again, I was back at the moment my brother went to find the heroine