Halo, the best musician of the time, suffers a traffic accident on the way to the Grammy ceremony. And when he regains consciousness, he finds himself in the body of a little Korean boy named No Hae-il. He finds himself in a completely different place and time. He confirms that No Hae-il's English name is Halo and feels a strong destiny. Halo, who entered Hae-il, proves to be a musical genius at this time as well.