"Animal World" is adapted from the Japanese manga "Gambling Apocalypse". The protagonist of the play, Zheng Kaisi, usually dresses up as a clown and works part-time in the game hall when he is free. The mysterious disappearance of his biological father and the sickness of his mother make the family even worse. His childhood made him bear a huge sum of money. Facing his mother in the hospital bed and his childhood sweetheart Liu Qing who had been waiting for him, he decided to embark on a ship to change his destiny and pay off the debt. At this time, a mysterious person told him that he could get money as long as he participated in the game on the boat. For a better life for his family, Zheng Kaisi agreed to join the game of survival, and a contest between life and death kicked off. People on board cheat each other, reveal their selfish side, and finally reduce the game to a bullfighting arena. In the end, Zheng Kaisi believed that his companion entered the small black room very much, but in the face of interests, the companion chose the latter. Zheng Kaisi walked out of the dark room by himself and redeemed him with money. The game planner found Zheng Kai again Division..