Han Da-jin, the first female pilot, managed to overcome a sixty-year ban on female pilots. Since childhood, she dreamed of following in her late father's footsteps. After finishing flight school, she takes a job with an airline and begins flying as a co-pilot with Kim Yun-sun. She does not know that Yun-sun was an unwitting culprit in an accident that killed her pregnant mother. However, the child was saved, and now Da-jin is raising her seven-year-old sister. During their first flight together, she makes a few mistakes. Yun-sun believes that Da-jin is not capable of becoming a competent pilot, but Da-jin believes otherwise.