鐵面無私

strictly impartial and incorruptible (idiom)

surname Tie

iron (metal) / arms / weapons / hard / strong / violent / unshakeable / determined / close / tight (slang)

iron mask (as defensive armor) / fig. upright and selfless person

face / side / surface / aspect / top / classifier for objects with flat surfaces such as drums, mirrors, flags etc

variant of 麵|面[mian4]

flour / noodles / (of food) soft (not crunchy) / (slang) (of a person) ineffectual / spineless

not to have / no / none / not / to lack / un- / -less

selfless / unselfish / disinterested / altruistic

personal / private / selfish