In the midsummer of his senior year, Shen Nan's father remarried and moved into the Shen family with Su Nian, who was two years younger than him. The reorganization of the family was dull and hasty. Everyone thought that it was just a well-behaved and sensible sister and an ordinary family bond.
In the eyes of outsiders, Su Nian is the perfect girl next door. She has top grades, a quiet personality, is considerate and sensible, and puts her brother Shen Nan first in everything. She would get up early to heat milk for Shen Nan, tidy the desk, silently write down all his preferences, accommodate all his habits, and be as gentle as a wisp of evening breeze that would not disturb anyone.