Adapted from the novel "I'm in Love with the Flower Fairy" written by Lan Jing. Gu Qingcheng (played by Li Linfei), a small gardener from Pingcheng, the "Flower Capital", was guided by a mysterious firefly and inhaled its "flower spirit" when he was treating a white peony. This white peony turned out to be the thousand-year-old half-demon Lv Gengyun (played by He Changxi). Because of her father's last words, Gu Qingcheng has been determined to save 9999 flowers since she was a child, waiting for the Fairy of Flowers to take her to the sky to see the person she wanted to see. That night, Lv Gengyun woke up in a huge white peony flower. This scene made Gu Qingcheng firmly believe that he was the Fairy of Flowers, so she worshipped him as her teacher. In order to find a way to take out the flower spirit and find out the truth about his parents' unjust case, Lv Gengyun had to disguise his identity and stay by her side, waiting for an opportunity to act. But who would have thought that Gu Qingcheng was actually a "flower thief" who was afraid of tigers... After experiencing a series of magical stories, the two gradually became connected. But facing the cycle of fate and the appearance of the real Fairy King of Flowers (Wang Haoxuan), the two have to face a new round of choices and challenges.