Although he has a slightly shy personality for a soldier, Murphy has a fierce past where, in order to retaliate against a street gang for mercilessly murdering his brother, he shot 20 members of the organization one after another with a hunting rifle. His god-like sniper skills, referred to as first-class in the Marine Corps, caught the eye of a coordinator who rescued him from serving life imprisonment, and he joined the U.B.C.S.