To be honest, Xu Xin really wanted to go with her.
That's District 1, territory he's never set foot in before.
But remembering Xu Ying's instructions, to not go out before the world tree has fully grown, and that the creature sent people to kill him...
He's actually not very worried about something happening. At least he thinks that staying around Crystal City, or within the 188th district under the influence of the world tree, shouldn't be a problem.
But Shi Wanyun is going to District 1.
District 1 is not protected by the world tree or Crystal City, and situations like Shi Wanyun's have happened there.
If he goes, it's basically walking into a trap.
Moreover, although Shi Wanyun can teleport, she must rely on a teleportation device.
In other words, she can only teleport back to her treehouse, or... to that bizarre world tree on the other side of Earth.
