Responses

As of yet, Lee Miseon is the only one who officially knows, as she directly asked the MC after she overheard his conversation with Alex Hope about "you can see it too?" (Chapter 44).
Kang Taewoo should have an idea about it too, since the MC is directly training his senses on mana (Chapter 38), and they have been through the same experiments too.
However, I forgot if the father knows too at this point in time... but anyways, the MC is keeping it undercover for the most part.
Do they know the mc can also see?