Do you remember the person you liked when you were 17? Xu You (played by Qi Yuchen), a southern girl with excellent academic performance, transfers to Linshi. She unexpectedly becomes roommates with the "school bully" Xie Ci (played by Zhang Zhehua). The two gradually get into each other's hearts while laughing and noisy. But faced a trick of fate. Many years later, the two returned to the place where the story began, only to discover that the joy of youth is like an apple-flavored lollipop. After going round and round, the first one is the sweetest.
