The Sweetheart Is Actually a Black-Hearted Schemer (Infinite Survival)

At first, everyone thought Shen Shu had been absurdly lucky to become the sole survivor of the previous survival game. He was considerate and gentlemanly, sympathetic to the weak, and always willing to sacrifice himself for others. He was practically a walking poster child for a sucker... a saintly, sweet, naive young man. Sure, sometimes he smiled at corpses, muttered to himself in a corner, or gave a teammate a strange look... But there was no doubt that he was an upright, kind, lovable young man. Until one day, he turned and walked into the light, closed the door, and left everyone behind him in the abyss. At last, people understood why he was the "sole" survivor. Note: At first, the protagonist is a saintly do-gooder. In reality, he's the final boss. Theme: Face life with optimism!