In Wing's room, Gon, Killua, and Zushi are being taught by Wing. He explains the 4 main principles: Ten, Zetsu, Ren, and Hatsu. He demonstrates how Ren works, by giving Killua an instinct of killing him. Because of the strong pressure of Wing's aura, Killua gets frightened and bounces to the corner of the room. Wing advises Gon and Killua to train with Zushi and start mastering Ten but Killua suggests that they should leave. On their way back, Killua reveals to Gon that Wing was lying all through the lesson. Back in Wing's room, he notices Zushi's Ten is unstable. Zushi explains the reason why Wing lied to them. Wing only says that for them to know what the other meaning of Nen is because if Nen was used in the wrong way, it could be dangerous. After clearing the 190th floor, Gon and Killua advance to the 200th floor. They are stopped by a strong aura which resists them from moving forward. The receptionist appears, stating that they should register before midnight. Hisoka out of nowhere appears in front of the two behind the receptionist and warns them that they are not ready yet. Wing appears behind them and offers to teach them the real Nen. Before they left, the receptionist also informs Killua that if he is not able to register at the given time, he will never be able to register again for he failed to register once. In Wing's room, he finally teaches Gon and Killua the real Nen.