八面玲珑

bā miàn líng lóng

be smooth and slick (in establishing social relations)

eight

miàn

variant of 麵|面[mian4]

líng

(onom.) ting-a-ling (in compounds such as 玎玲 or 玲瓏|玲珑)

lóng

tinkling of gem-pendants