How Can an O Be so A?

An S-class A in high school met a little O after transferring to another school, and fell in love with him at first sight. Even after being separated for five years, her love for him has not changed. Little O, who seemed aloof on the surface, was severely depressed. After meeting A, he felt that he was finally better. However, he had to be separated from A because of his mother's fault. After five years of separation, he fell into an endless abyss. After five years, A, who still looks sunny on the outside, spends all night with smoke and alcohol behind his back. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.