A doctoral student in physics travels back to high school. Was the previous ten years wasted? Lin Zijun only wants to return to normal life, to the right point in time when he has made all reasonable choices, that is, freedom (the breakup), studying one of the most difficult majors (not liking physics), and doing an enviable job (not an ideal career). My first love and my high school roommate will get married in the future - nothing, I just watch with cold eyes; genius high school students have no life pressure - nothing, I have a strong ability to withstand pressure; good friends and family are within easy reach of care and attention - nothing, after I go back I only need to endure a little distance, time difference, and a lack of understanding... However, the good days in the past have been too long, and he can't bear to let go of the old love, friendship, family and new studies. Lin Zijun began to panic. Were those self-proclaimed rational and optimal choices in the past wrong?
