They are high school painting and art students in two cities. When they were studying in different places, they were originally from two different worlds. An accident changed their entire youth trajectory, and tied the youth of two unrelated people together.
Boys have good academic performance, are handsome, and grow up with a silver spoon in their mouth. They are called "other people's children". Girls have average academic performance and average appearance. They are ordinary or even inconspicuous children. The boy loves the girl especially, and he protects her little "self-esteem" in her heart. Everyone is laughing at the girl for thinking that "the sparrow flies on the branch and the phoenix flies", but the boy stands up and tells everyone that he is the "sparrow".
The low self-esteem made the girl keep shrinking, and the boy told her "we can be together" again and again. They finally fell in love, but the boy's family arranged for him to study abroad. They have experienced four years in a different place and a foreign country, facing a 12-hour time difference every day, but they have endless love every day. More than three hundred air tickets and train tickets are proof of their love. Everyone thinks that they should be together, but they are facing a breakup...