But how could Glarus and Yue Xi, who are not related by blood, be a team?
This, actually, there's nothing special about their story.
It just so happened that when Yue Xi was caught stealing, she was arrested, and the scruffy uncle was also there as a slave, so the two were locked up in the same cell.
Just then, Handlebar Mustache came to buy slaves.
Glarus overheard his requirements and immediately discussed it with Yue Xi, they lied about being father and daughter to get out of their predicament sooner.
Escape was impossible since they both had the slave branding, and it seemed unlikely they'd ever have another chance in this lifetime.
Moreover, as the girl had no real skills, going out would mean continuing to steal and then waiting to be caught and beaten to death.
Being a slave was certainly miserable, but at least there would be food to eat.