Not exact but maybe kidnapped dragons?
Apparently, it is an original webtoon. Some guy in the comment's said so in the spoiler thread for it. (earthdrake, 7 down).
You could talk at length about a topic which he has no interest in (like politics), and when he says that he doesn’t care, just say that it is...
Your sister is correct. Let’s say the doors are A,B and C. I chose door A and you said door B is not correct. Now I am left with door A and door C...
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