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A fat man named Chen Xiao was good at all subjects, even physical education. He has always had a crush on the school beauty He Meng, but he has no self-confidence, so he is determined to lose weight, but he has been unable to lose weight. In the year when he graduated from high school, he knew that He Meng was hit by a car and died. He wanted to cry but had no tears, but he traveled through time...

He Meng, a girl who lost her mother at birth, grew up with her father and never smiled in front of others. When she was 18 years old, she met Chen Xiang. Chen Xiang has been helping her and trying to make her laugh. However, Chen Meng left this world a year later, and she laughed, a smile with tears...

A neglected senior high school student experienced a mysterious thing on a mysterious day, changed his identity, and started his new journey...