穿堂风过路人
[chuān táng fēng guò lù rén]
Literally means 'Hall wind passer-by', where '穿堂风 (chuān táng fēng)', meaning cross-breeze, is combined with '过路人 (guò lù rén)' or passersby. This could represent transient people or moments that only slightly touch one’s life, like passing winds going through the halls of a building.