爱玩少年会表白爱笑少女不矜持
[ài wán shăo nián huì biăo bái ài xiào shăo nǚ bù jīn chí]
It describes youthful carefree attitudes: A playful boy will declare his feelings, and a smiling girl won’t hold herself back. It captures lively youth, spontaneity in love, and the absence of shyness among young lovers.