My theory is their ears and tail cannot be seen from other people including the other sooins! (づ￣ ³￣)づ
The doctor already covered this. As the sooin grow older, it becomes easier to hide their animalistic characteristics. There is also the environmental factors at play. If the bear grew up around other sooin, he would have had mentors to guide him along as he grew. Teaching him how to blend in with normal society. Hae-won has not had that privilege.
Ooo thanks for the explanation
Your very welcome.
How does not the bear sooin have ears and tail when the wolf sooin have both???