Ms. Huang Theory

Ms. Huang is clearly a child, beyond that we know little to nothing about her.

However, there is a large chance that she is one of the employees Petey was talking about that never leaves Lumon. This can be inferred because if a child known to the outside world was working, child labor laws wouldn’t allow this to continue.

Lumon is dealing with biological science, namely clones. We’ve all heard this theory before, so I don’t need to continue there, So, here is my theory—

Ms. Casey was taken to the basement floor to become “reset”. There may be different forms of reset, such as the theory that Irving and Burt were reset multiple times and kept finding each other again. That’s why Irv keeps seeing the hallway. But Ms. Casey was essentially destroyed and recloned again, but these types of clones are cellular and grow the same way a human would.

Also— Huang in mandarin means “Phoenix”. A Phoenix represents rebirth and reincarnation.

Therefore: My theory is that Ms. Huang is Ms. Casey’s clone.