The Villain in I Just Want to Survive Has a Super Abnormal Heroine

In an accident, I rescued a drowning beauty. As a result, I sank to the bottom of the lake due to cramps in my hands and feet, so I was asked to travel back in time and be the villain in the thesis book. As long as he survives until the male and female protagonists get married, at the end of the play, he can return to the real world with the generous reward from the system to treat his father's cancer. But! Is this heroine abnormal? No, why are you following a villain like me? Do you think I won't die quickly enough? Is this right? ? How abnormal! Well, in that case, I might as well compete with the protagonist! Whether it's a dragon or a tiger, we'll see!