The film tells the sweet and passionate love story of a pair of lovers who are in a relationship of a sister and a brother with completely different identities. Returnee Puff (Zhang Xinyi) met a takeaway boy Gu Shang (Wang Yuexin) at a party with her bestie. In the chaos, the two escaped from reality and spent a wonderful night together. Then the bold and resolute Puff launched a crazy pursuit of the good student Gu Shang. After a brief contact, the two secretly got married and started a thrilling fairy tale adventure.