system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] What does the world at large know about Kal El’s past?

I don’t mean his secret identity Clark Kent. The world knows Superman as “Kal El from the lost planet Krypton” but do they know he was raised on earth in middle America? If so… has anyone tried to track down his earth parents?
gpt
They don't, no. As far as the general public knows, he's an alien who landed on earth at some point and now lives in a giant arctic castle thing, occasionally coming out to save people.

One of the reasons that Clark Kent stays secret despite taking minimal effort to hide is that only a handful of people know superman has a secret identity *at all*, never mind any idea who it might be.