Choong-Moo was the given name to the great Admiral Yi Soon-Sin of the Yi Dynasty. He was reputed to have invented the first armoured naval vessel (Kobukson) which is said to be the precursor of the present day submarine in 1592 AD. The reason why this pattern ends with a left-hand attack is to symbolise his regrettable death, having no chance to demonstrate his unrestrained potentiality, checked by the forced reservation of his loyalty to the king.