白衣少年不再回来
[bái yī shăo nián bù zài huí lái]
The White-clad Youth Will Not Return: Evokes nostalgia for innocence lost. Usually refers to someone or a past identity that embodies purity or naivety, a youthful period filled with dreams and idealism, all of which are unlikely to return, symbolizing a permanent change and acceptance of adulthood's realities.