Wen Yan has no soul, so he won't be devoured by the river's soul-consuming rule in the Netherworld. That great river only targets creatures who can enter the Netherworld—it's useless against Wen Yan.
And to top it off, Wen Yan is still a living person, and he even has the Calamity Protector Water Official Talisman, a heavenly Treasure Talisman, so he won't drown either.
All these traits existed before the Netherworld even appeared.
Any code written afterward can only try to accommodate the pre-existing spaghetti mess. That makes sense, right?
Otherwise, it would need a total overhaul, starting from zero.
But unfortunately, Wen Yan is a living human. If you want to change things, you'd have to rewrite the whole real world along with it.
This absurdly huge mess is just sitting here; the Netherworld can't shake it, so it just has to make sense.
Wen Yan not getting lost in the Netherworld is also something he acquired inside the Netherworld, which is perfectly reasonable.
