那抹少年蓝那抹姑娘情
[nèi mŏ shăo nián lán nèi mŏ gū niáng qíng]
This nickname evokes nostalgic feelings, referring to the purity and sweetness of youthful romance between a young boy (symbolized by the blue color) and a girl. It captures the innocence of first love and longing.