The female protagonist broke off contact with the male protagonist after graduation because of a misunderstanding. They reunited in Hong Kong after ten years of separation.
The two gradually solved their misunderstandings during the conversation. They agreed that as long as they drank the "icy but not sweet" frozen lemon tea, it would mean "I miss you." One time, the heroine accidentally discovered that the umbrella she had lent to the hero was engraved with the word "Mortal Earth". This was the splicing of their names, which meant: Even if you fall into the mortal world, I will still love you.
The male protagonist supports the female protagonist to write songs and do what she likes. With the encouragement of the male protagonist, the female protagonist writes her first single "Rainy Season". This song was inspired by the umbrella she lent to the male protagonist in high school. With this song, the female protagonist successfully signed a record company and became a big success; the company run by the male protagonist is also booming. Both shine in their respective fields.
In the end, the two got married and lived happily together.
Intention: Reunion after a long absence, running in both directions to achieve each other's success