Taming The Raven System

Abandoned by his mother and bought by the government, Asael has awakened an artificial system that has been installed in his body by the government so that he can become an invincible test subject for them. But the problem arises when the system refuses to be tamed. So now to tame his system Asael must become an S-class assassin and to take back his freedom he is required to defeat the government.