幽深少年阳光少女
[yōu shēn shăo nián yáng guāng shăo nǚ]
'幽深' suggests deep-seated feelings; '少年' is young boy/boyishness and '阳光少女' is bright girl/fresh girlhood. Thus this phrase contrasts between the mysterious boyish sentimentality and optimistic vivacity from female perspective. Usually used in romance literature or drama to build characters or moods, indicating the different characteristics they have.