|You can reach this special map by visiting Yu-Hwan.
Write down the name of the opponent you wish to challenge to Yu-Hwan and he will receive a duel invitation in the mission list. If she answers Yes, you'll both be teleported to this special map.
After entering this map there will be 3 rounds between the two opponents. The one who knocks at least 2 times the other opponent is declared winner.
During the fight, the use of potions is not possible. The level difference between the two must not exceed 15 levels.