Yixun (played by Chen Yirong), who suffers from congenital complex heart disease, has been isolated from sports since childhood. During every physical education class, she is arranged by the teacher to rest on the side. Watching her classmates jumping on the playground, Yixun feels lonely. Fortunately, her classmate Qingchuan (played by Xu Shaoyang) often accompanies Yixun, and she is relieved. In a blink of an eye, Qingchuan's family is going to immigrate to the United States. Before going abroad, Qingchuan brought Yixun to his secret base-a waste gas flower shop full of lavender. Qingchuan gave Yixun a bottle full of lavender, and agreed to meet again in front of the elementary school on Yixun's 20th birthday. Time flies. After growing up, Yixun works in a flower house. Her colleague and good friend Xiaotong (played by Wang Jianlong) has always been secretly in love with her, but Yixun has been waiting for her childhood love. Yixun's 20th birthday is coming soon. On this day, she recognized the idol LEO who returned from abroad on TV and found that he was Qingchuan she had been waiting for many years! At this time, LEO was holding a solo concert called "Looking for Lavender Lover". Yixun was blushing and her heart was beating fast. She was surprised that she finally met her first love, but she was afraid that she didn't know whether the lavender lover Qingchuan was looking for was her. That night at LEO's concert, Yixun mustered up the courage to go with Xiaotong to look for her childhood lover.