This novel mainly tells the story of a man named Bird who returned to 2004 because of an accident. The introduction of the book is like this: an ordinary engineer suddenly found himself back in the college entrance examination after working overtime and taking a nap. He failed to apply for the exam in his last life, so he dare not float again this time. He honestly grasped his upper limit, changed his second life in a brand-new way, and ushered in various waves of life.