I think either the author or the translator is horrible at math. The ring the MC is so proud of had 4 cubic meters of storage space. That is EXTREMELY small. 15.87 millimeters x 15.87 millimeters x 15.87 milimeters or 1.5cm length/width/height. It's not 4mx4mx4m... that would be 64 cubic meters.
Is it only one Xiao family in universe? Why MC always think that two people with same surname from one family?
There more than100000 people in test, do you think there is only one Xiao?