笑里透着伤不是么伤里不还是有笑么
[xiào lĭ tòu zhe shāng bù shì me shāng lĭ bù hái shì yŏu xiào me]
It expresses the mixed feelings where laughter coexists with pain and pain can coexist with laughter - implying resilience despite hardships: ‘Laughter through tears and tears through laughter.’