I'm guessing that his poor social interactions and skills play a vital role in his own development. Although fictional in this case, humans are social creatures and when that aspect is inhibited one way or another a person might become detached and undervalue themselves.
I even thought for a moment that maybe he had a mental disability or was neuro divergent. Honestly, topics like this are very interesting to discuss in works, especially BL because of the conflict who are very rich and powerful, even extreme. Even though this is just fiction
technically his inability to discern faces is a form of neurodivergence - it's not a disability per se (at least is not classified as one as far as I know), but it is without a doubt a divergence from the typical neural pathways
It really is! I love noticing characters' depth and their mental work. It's interesting how the author treats and sees those same aspects
Isn't this kind of inferiority complex usually shown by people who "don't have anything?" But look at this omega, he's the head of a company and even has a baby from another heir, but he still have a high level of insecurity, even to the point of not being able to express his feelings.