Neo's line is what finally made Ying Ying's serious aura break, she could not hold back the little chuckle that escaped her. Something about the combination of neutral and dramatic was very comedic to her. They had always been like that since they were younger, the banter may have been a coping mechanism but it was almost second nature now.
When they had first met, the three of them were abandoned children roaming the streets. She had been there for a lot longer period of time before she met them. They were not related but walked around with their hand in each other grasps. It didn't take much of a genius to see that they were very dependent on each other, probably finding themselves as their only support in the situation.
