Crying Freeman

He is You Himomura, deadly assassin for the 108 Dragons, the Chinese Mafia. But to the criminal underworld who fear him, he is known as Crying Freeman, the killer who sheds tears at the fate of his victims. Young, handsome, sensitive, an artist, You has been hypnotically programmed by his Dragon masters to kill on command: he cannot resist his masters' commands to kill, his masters cannot stop his tears of remorse.
(Source: Dark Horse)