"Then what is his disability?"
"He is a rare conjoined person!"
"Conjoined person?"
"Yes, two heads sharing one body! It's caused by incomplete separation of the fertilized egg; they have difficulty living like normal people. When they enter The Second World, they also have inherent differences compared to others. Their two heads are like two players, but not truly two players in the strict sense. To some extent, their thoughts can be shared, but they each have independent parts. So when they enter The Second World, they have two characters. The characters share everything but can develop independently."
