百里情深不及她笑颜诋毁
[băi lĭ qíng shēn bù jí tā xiào yán dĭ huĭ]
'Within miles of deep affection, it can't match the impact of her smile' expresses that even strong emotions pale in comparison to her influence, especially the devastating effect of seeing her smile, often hinting at unreciprocated love.