I keep going back to Jon being allowed to get on a Dragon, I doubt they let anyone do that, and it seems like only one house has ever been dragon riders which is Tagaryon. I tend to think that Drogan knew that Jon was part of that house, and just didn't have the desire to kill him.
It made me wonder if the Night King was a Targaryon as well.
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My name is Ozymandias, King of Kings;
Look on my Works, ye Mighty, and despair!
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