This is a story about secret love and courage.
Nineteen-year-old Su Yuan secretly looked at the boy named Lin Nianchu at a high school reunion. His name had been buried deep in his heart for four years. She posted countless posts to Moments, just waiting for a like that would never appear; when she graduated, she chose to work in a bank one kilometer away from her home, just because his home was also three kilometers away; she had listened to Eason Chan's "House of Flying Daggers" and knew what it was like to have "the whole city come to hit you, but in the end there are dangers everywhere."
When the boy she has been secretly in love with for many years is suddenly "officially announced" to receive the certificate, and when her world collapses and is rebuilt overnight, Su Yuan finally understands - waiting will not bring any response.
Starting from a cautious "Let's sing together next time" and a WeChat message recommending a location, she decided not to be the person hiding behind the circle of friends anymore. This summer is very long, long enough for a timid girl to learn to take the initiative to go to the person she likes.
And at the other end of the story, is the boy who is always gentle and polite and never crosses the line, silently responding to this long wait in his own way?