FTA: > Then he declared that there is another distinct problem — why the brain’s behavior is accompanied by experience at all — which he christened the “hard” problem of consciousness. The hard problem isn't about "why", it's about "what it's like". Try to explain what it's like to hear a major and a chord to a deaf person, or what it's like to see magenta to someone who's blind. None of the things you say, sign or w…
Qualia is the term people often use to mean "what it's like". The hard problem is "why is there qualia". This of course assumes that qualia exists as a coherent thing, which some philosophers dispute.
This reduces to the intractable mystery of existence. A more interesting question would be, as usual "how".
There are serious attempts at this, coming from both neuroscience and physics (e.g. for the latter https://pubs.aip.org/aip/adv/article/15/11/115319/3372193/Un... )