Where did the sister come from?

Seeing that it was getting late, Tymon Well apologized to Yan Mengping and his wife, thanked them for taking care of Jin Ya, and then said goodbye.
The Maori couple escorted Tymon Well and Jin Ya out of the elevator. Because the elevator was occupied, Tymon Well waved to the two of them, held Jin Ya, and led the stupid bear, and walked down the stairs.
Fang Zheng and his friends' rooms were only two floors apart. Instead of standing and waiting for the elevator, it would be faster to walk...