My theory is that Kai teleport in Kwangya without knowing it but he got stuck and don't know how to go back to the Exo planet
If you saw Aespa "next level " ep 1 you should have notice the similarities between Kwangya and the scene of Kai
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and that the Exo Member are now looking for him and coming to rescue him
that's maybe why the EXO new logo look like a radar use in submarine etc... to detect the presence of other submarine etc...
that would make sense since EXO comeback have been tease at the end of KAI solo debut