你笑假面如花我笑面如春花
[nĭ xiào jiă miàn rú huā wŏ xiào miàn rú chūn huā]
This username means 'You laugh with a smile as beautiful as a flower; I laugh with a smile like spring blossoms.' It expresses two people's happiness and the comparison of their smiles to flowers, conveying warmth and joy.