Responses
Spoiler
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You're right, the eldest can't bear the heavy weight of the crown so he faked his dead, but don't worry he will be reunited with MC at the ending of the mainstory
I don't think the oldest brother really died coz there's always this mystery about a tiger i kept on seeing and the fact that there's no body and anything else makes it plausible that the oldest didnt died yet cursed maybe