After My Rebirth, My Brother-In-Law Married a Wealthy Daughter for Me.

My brother and I traveled back to the emperor half a month before we found the real prince. My brother explained his identity to the false prince before I did. When he proudly challenged me, thinking that he could seize my life from now on, I was grateful to him for helping me get rid of a big trouble. The false prince is ruthless, and his dungeon is full of bones and rotten flesh. If I hadn't been lucky in my previous life, I would have become one of them. What awaits me is my brother's imminent death.