一抹浅笑勾勒谁的悲伤
[yī mŏ qiăn xiào gōu lè shéi de bēi shāng]
Translating as 'a faint smile sketches whose sorrow'. Conveys complex sentiments involving hidden emotions or sadness disguised by a slight smile on the surface, possibly reflecting bittersweet or conflicting internal states.