The biggest regret in life is to meet a special person but never be able to be together. Sooner or later, you have to break up.
Su Tong is like this for Shen Sijing. The joy they promised each other when they were young, but when reality comes, only one person is suffering from the pain, drifting in a world without that person.
This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.