Is it possible for someone to completely disappear from this world?
Actively, I mean, by hiding and not being found?
Strictly speaking, it's possible, but very few people can achieve it.
For instance, hiding on some island, never contacting the outside world, perhaps it's possible to conceal oneself.
But in most cases, if you don't leave human society, it's difficult to hide yourself.
Checkbooks, bank deposit and withdrawal records, including various receipts, all form a layered information network. With enough money and professionals in charge, it's easy to be found.
Professional Hunters around the world have their own sources of intelligence. After they caught the fake ID maker who created a false identity for Charlie (妹), they obtained her purchased ticket from customs.
Subsequently, they even found the city where she was in hiding.
There's nothing remarkable about this; as long as people live in this world, they always leave some traces.
