Possession

Beneath the Overworld, in the Underground Empire Jeojeojeo, the 17th Great King suddenly declares that they are leaving the throne. A contest is announced and the winner will get to be the new Great King. A Rank-A prisoner, the dethroned half prince named Jet, follows his father's command and participates in this contest but…

"What? To be the great king I have to protect that loser?!"

That is the "Token". Jet needs to protect it in the fierce competition of the Underground people, where each person has to protect a "Prince's Token".