백년하청in English:waiting for something that will never happen

Examples
with 백년하청.

• 그는 백년하청을 기다리는 것처럼 아무것도 하지 않았다.geuneun baengnyeonhacheongeul gidarineun geoscheoreom amugeotdo haji anhaetda.He did nothing as if he were waiting for something that will never happen.