Zhou Yi is a gentle and timid ordinary young man. His only specialty is that he is so lucky that he seems to be possessed by a koi carp. One day, he was accidentally pulled into a holographic survival game called "Humanity Experiment" - each copy in the game is a carefully designed moral dilemma, and the "Observer", the manipulator behind the scenes, is taking pleasure in human emotions and choices, trying to prove that "human nature is inherently evil." Zhou Yi's koi physique allows him to frequently trigger hidden rewards and escape from desperate situations, but every time he has good luck, there is a deeper trap hidden behind it. While using his timid but delicate instincts to take care of his teammates and resolve crises, under the cold gaze of the "observer", he used gentleness and kindness to subvert the experiment's preset "dark ending" again and again. When the game world intertwined with reality, Zhou Yi discovered that he was not only an experimental subject, but also the only key to breaking the shackles of the "humanity experiment". Can he use the luck of a koi to win this game about the hope of mankind?
