Never Called Down With King High Before

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Why is it aggressive?
And how often do you win against this kind of opponent with K-high? Close to never propably?

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Because he is seeing 90 % of the hands and then doing more betting and raising post flop than checking and calling.

He's gonna miss nearly all the time so he is often betting/raising with nothing or very little.

I think this calldown is fine in this spot 4 handed.