thih-pán-bīn鐵板面

to act serious and fair

to act serious and fair; to look ghastly pale, ashen, or livid

English Wiktionary, “鐵板面” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E9%90%B5%E6%9D%BF%E9%9D%A2 · confidence: Medium (Wiktionary)