As a college girl who was called a gangster by her roommates, she used her smile, carefreeness, and boyish personality to cover up her pain, sadness and inferiority. After a sports meeting, she was sexually transformed into a boy for various reasons and returned to the age of ten, when the family had just undergone a huge change, and she struggled to grow from a small sapling that had not grown crooked to a towering tree. This youth growth story may be very refreshing, just to make up for the author's regrets.