how many cassiopeia who will attend DBSK's Tokyo Dome double concert?

• least than 10,000 cassiopeias

• 10,000 - 20,000 cassiopeias

• 20,000 - 30,000 cassiopeias

• 30,000 - 40,000 cassiopeias

• 40,000 - 50,000 cassiopeias

• more than 50,000 cassiopeias