At an altitude of 10,000 meters, female pilot Zhu Qingyuan issued an emergency call for help, but unexpectedly heard the response from her ex-boyfriend He Jinzhou. Five years ago, the two were forced to break up due to misunderstanding, but five years later, he became her air traffic controller. Time has not eliminated love, but has allowed those who can't let go to renew their relationship. As the misunderstanding was resolved, the two finally fulfilled their promise - she flew high into the sky and he guided her.