夏天里的那个薄凉少年冬天里的那个暖阳少女
[xià tiān lĭ de nèi gè bó liáng shăo nián dōng tiān lĭ de nèi gè nuăn yáng shăo nǚ]
Describes a person who is 'the indifferent boy in summer, the warm girl in winter.' This shows a contrast in personality, perhaps referring to someone whose nature changes with the seasons.