This is regarded as one of the most renowned works of Kim Jeong-hui (pen-name: Chusa), written in the regular script. The lines, meaning “One should know when to remain silent and when to laugh,” were inspired by the pen-name of his close friend, ‘Mukso Geosa’ (meaning, ‘a person with a silent smile’). One can see that it is written with earnestness, and the sharp brush strokes show the great calligrapher’s depth.