My Mafia Girlfriend Is a Spirit

I've been able to see spirits since birth. Everyone said I was cursed, so my parents gave all their love to their adopted son. But when the De Luca Mafia heiress fell into a coma, he backed out of the engagement. Only I heard her spirit say: "Twenty million crystals. I'll give them to whoever takes care of me." So I raised my hand. "What if I marry her instead?" I was the only one who knew this was a winning bet. What I never expected was my brother rushing back to marry her the moment she woke