Eternity by Park Jin-Ryong. A Fantasy manhwa rated Teen, published in English by Tokyopop.

In the year 184, three leaders named Yoobe, Kwanoo, and Jangbe rose up against a tyrannical Chinese regime and were executed for it. In the present day, Aram Ko, a 17-year-old shaman whose family line was bound long ago to serve Kwanoo, sets out to find the three men's reincarnations. A Korean fantasy comedy that mixes ancient legend with modern life.