Only Gu Yang can calm Xu Zhou's temper.
Only Xu Zhou could understand Gu Yang's small grievances.
They were all trapped beasts who had huddled in the dark corners of the world and were trapped by themselves. It was not until they met that they began to be eager to move towards the sunshine outside.
Xu Zhou: Gu Yang, you are my sun
Gu Yang: Xu Zhou, you are the only boat coming towards me.