Liu Yang spent the next month inside the hotel room, he didn't even bother to spend the crystals because it was not even his, the crystals were stolen by him and Millia after they killed the bandits. He didn't worry too much about spending.
His decision to stay inside the hotel was because of Aisha, he did not want to leave her alone, as there may be some problems. Furthermore, she cannot leave the city because her level is very low.
Aisha was only at level 1. Only those who were above level 51 can leave the city.
Liu Yang could level her up by defeating the crystal creatures while Aisha is inside the city, but close to the exit. But he didn't do it because there were some dangers of her being alone.
Besides, he would have to enslave her for this to work, so he chose not to do any of that. Aisha has already suffered a lot, he didn't want her to suffer anymore.
