He is his brother's friend.
The first time they met was when she went to the city to resume her studies, and her brother asked him to take care of her.
She fell in love with him at first sight.
Later, when she went to college, she came back from vacation to meet his girlfriend and learned that they were planning to get married.
She deleted all his contact information.
After graduating from college, she returned to his city.
She didn't have any hope, but he said: "Do you have to be me? If so, will you marry me?"
Concept: The luckiest thing is that the person you love also happens to love you