She was once a backgammon genius, but she lost herself in marriage; he was a cold-blooded lawyer with 327 unsent confessions in the draft box on his mobile phone. Ten years of secret love began in a game called "Jiaojiao" - he taught her how to synthesize a big watermelon, and she taught him how to love. When a single mother meets a boy from the past who is planning to reunite, who will say "don't run away" first this time?