XANADU
This legendary criminal is currently imprisoned in an underground jail. He has ideas and concepts hard to understand for the average person. Xanadu is considered as the "King of the Underground" by the other prisoners. Will he bring back Chang and Choi to their dark days again?

CHANG KOEHAN
Once a feared and violent criminal, the two-meter-and-more-tall Chang battles with an enormous iron ball he spins like a tennis ball. Chang trained hard in the past in tae kwon do while under Kim's "Rehabilitation Project", but he teams up now with Xanadu.

CHOI BOUNGE
Butcher during the day, Choi was once feared as a ripper during the night. Choi gives a hard time to his opponents thanks his super speed and claw attacks. One day, he chanced to have stalked on Kim during one of his nightly walks, and was then forced to join his "Rehabilitation Project". His rehabilitation program over, Choi teams up now with Xanadu.