Forced to Take My Big Brother's Place, I Seized the Wealthy Family's Fortune

After five years in prison, I had barely been released when I was forced to take the place of my twin elder brother, who had been attacked and left in a coma. I moved into a top-tier wealthy family. A cold contract was signed, my aloof sister-in-law treated me as nothing but a puppet to keep her going, family elders made things difficult at every turn, and assassins kept coming for me. Every step was a deadly trap. Luckily, a god-tier sign-in System bound itself to me! From the start, I signed in and got a black card loaded with hundreds of billions, then unlocked peerless medical skills, top-tier ancient martial arts, and invisible influence. I kept a low profile and played the pig to eat the tiger, dealing with villains, crushing financial clans, and taking control of the wealthy family. As my sleeping elder brother was about to wake, my usually cold sister-in-law clung tightly to me, her eyes full of reluctance. I spread my hands calmly: I've been a stand-in for long enough. I'm keeping this family fortune worth hundreds of billions!