路人丙的一段长相厮守
[lù rén bĭng de yī duàn zhăng xiāng sī shŏu]
'路人丙' translates to Passerby C (a common reference in Chinese literature). The phrase depicts a long-lasting relationship from the perspective of someone who may just be considered as background characters, expressing desire or nostalgia for lasting companionship even in minor roles.