I'm expecting the identity issue resolves in the next chapter, because I'm waiting for the big turn of events an sh*t hitting the fan when the stone makes something unexpected.
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I agree with you but, unfortunately, I wouldn't say it's unrealistic. There are so many people around acting like that. Crazy as it is, some people seem to believe others are bastards if they don't read their mind properly. The main difference with these characters is that, those kind of people, even change their mind almost everyday, and this makes even more difficult to predict their needs.
But really, I agree with you. A little suspense is ok, but this is becoming ridiculous. Let's hope there's something more behind the stone that justifies this long long misunderstanding.
I can not help but laughed at how overly dramatic these characters are behaving in this manhwa. It seems like the problem will be solved as soon as these two decide to sit down and communicate instead of yelling at each other and leaving the conversation half way. The author is trying to keep up the suspense but at the cost of sabotaging the characters' appeal :/