Before the College Entrance Examination, I Was Forced to Bind to the Rendanruju System

In my previous life, before the college entrance examination, my sister was bound to the Rendanruju system, and I was bound to the Tenacity system. Unexpectedly, my sister did not fight, fight, or work hard, so her grades plummeted. After she failed in the college entrance examination, she felt that it was not respectable to go out to work, and she ended up in poverty. And I relied on my tenacity to study hard and became the top scorer in the college entrance examination. The rich male god was like a hero and couldn't help but treat me and regarded me as a myth. My sister was filled with jealousy and jumped off a tall building while holding me in her arms. When she opened her eyes again, my sister was the first to bind the tenacity system. "I'm too tired to study. It's better to just let the rich people surround me. This time, let me become the myth for you." But she didn't know that all the gifts of the tenacity system need to be repaid by the bound person double, otherwise they will be wiped out by the system. And the days when I could enjoy the fruits of my life without fighting or grabbing it were finally my turn.