On March 29th, 20 13, Lin Senhao did an experiment with his classmates, and remembered the medicine left over from the last experiment that day. On that day, in the dormitory, Huang Yang talked about the arrival of April Fool's Day while playing games with other students. He came up with a program to cheat people. At that time, Lin Senhao saw his smug smile, and he remembered that he had heard that other schools used drugs to deceive people. He thought, he poisoned Huang Yang first, and the poisoning was to play an April Fool's joke on the victim and make him feel worse.