He shouldn't do this but have you considered:

1. This weekend was terrible
2. He is only going to have to spend more time talking with people who thinks he is evil and hate him
3. If he messes up there's going to be a war
4. Someone is killing Shanghai enclavers in order to start a war between New York and Shanghai
5. A kid whom he used to play tag with is dead

So, in short, Lan Xichen thinks he deserves to be the one who visits Masozi to check how he's doing on Isolated Mandarin Studying and see if he needs help.