Responses
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cos he was always being treated as less talented as Tia even though she is going to be his wife, and he blame Tia for killing her mother, since her mom died of birth complications. So i guess he remained with a childish attitude. What started out as getting closer to Jieun to be petty and ridicule Tia, made him vulnerable to the controlling magic that Jieun casted on him to torture Tia.
All this has happened and the protagonist hasn't even appeared yet