Xia Fan Xing, a cheerful and sunny high school student, is known as a "treasure classmate," offering solace to any wounded heart. Sheng Yang, a transfer student and former champion of the National Youth Table Tennis Championships, was forced to give up table tennis for various reasons until he met her. To help Sheng Yang overcome his gloom, Xia Fan Xing uses both gentle and forceful methods, creating a series of hilarious situations. During their time together, Sheng Yang gradually discovers that this seemingly sunny and emotionally supportive "treasure classmate" actually harbors unspeakable pain, masking it with sunshine.(Source: iQIYI)