我是柠檬而你喜欢甜
[wŏ shì níng méng ér nĭ xĭ huān tián]
Translated as 'I am lemon while you love sweetness', this reflects two different tastes or natures in contrast—one more sour, sharp (or realistic) and the other more optimistic, gentle and sweet (or daydreamer). This can also refer to someone feeling bitter about something while knowing their companion stays on the brighter side.