我喜欢你的假装快乐我喜欢你的温暖笑容
[wŏ xĭ huān nĭ de jiă zhuāng kuài lè wŏ xĭ huān nĭ de wēn nuăn xiào róng]
It conveys 'I like your pretend happiness and your warm smile'. This nickname implies a deep affection for someone's demeanor, even when they are putting on a facade of happiness.