Exactly. They act superior because they are victims. But they expect that brother will be agree to ruin his lil brother's life. When Taeho outcast him, his brother's love gave him guts to stand again. His lil brother behave strangely because he love his elder brother more than any one and he has a mental problem. Also Yura now appear like an angle but she also had a affection seeker type mental problem (surely she is not a psycho) because of her beauty.
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Omegaverse >ω< https://mangamirror.com/manga-list/106967
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Historical BL ♛➛ https://mangamirror.com/manga-list/122136
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Best stories ⛧⁀ https://mangamirror.com/manga-list/106911