Harley, a destitute girl, got adopted by Duke Ernst at 7 years old when she lost her mother, as the Ernsts had themselves lost their youngest daughter Arina and sought Harley due to her resemblance to the late girl. Even though she received all kinds of persecution by the three Ernst sons in 20 years of life at the Ernst estate, she could finally escape that blood-and-tear inducing life when she was about to get married.
But what is this? When I woke up from my sleep, I'm back to that hellish childhood! Is this a dream?! Hmph. If I can't wake up from this dream,  I'll at least live without too much consideration for others now!
Just like that, Harley decided to go astray. Eugene, the "dutiful son" but cold, Cabel, the roughhousing knucklehead, and Erich, the angelic-looking bully and Arina's twin, all three be damned!
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Harley thought that marriage would be her ticket out of the Ernst household and away from the family's three sons, aka her perpetual tormenters. But on the eve of her wedding, she's transported back in time 20 years to a youth she'd hoped to forget. As long as she's getting a second chance at childhood, Harley's determined to stand up to her bullies. But what began as retaliation quickly turns into reconciliation as both Harley and the Ernst brothers come to understand each other's pain.
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Original Webtoon: <a href="https://webtoon.kakao.com/content/%EA%B7%B8-%EC%98%A4%EB%B9%A0%EB%93%A4%EC%9D%84-%EC%A1%B0%EC%8B%AC%ED%95%B4/2367">Daum</a>, <a href="https://page.kakao.com/content/54286072">KakaoPage</a>
Official Translations:
<ul>
<li><a href="https://tapas.io/series/harley-takes-the-house/info">English</a></li>
<li><a href="http://kuaikanmanhua.com/web/topic/7024/">Chinese (Simplified) / 汉语</a></li>
<li><a href="https://tw.kakaowebtoon.com/content/%E5%BE%81%E6%9C%8D%E6%88%91%E7%9A%84%E8%A8%8E%E5%8E%AD%E9%AC%BC%E5%93%A5%E5%93%A5/216">Chinese (Traditional) / 漢語</a></li>
<li><a href="https://delitoon.com/webtoon/mes-freres-infernaux">French / Français</a></li>
<li><a href="https://id.kakaowebtoon.com/content/Beware-of-the-Brothers/158">Indonesian / Bahasa Indonesia</a></li>
<li><a href="https://piccoma.com/web/product/55776">Japanese / 日本語</a></li>
<li><a href="https://th.kakaowebtoon.com/content/%E0%B8%A3%E0%B8%B0%E0%B8%A7%E0%B8%B1%E0%B8%87%E0%B8%9E%E0%B8%B5%E0%B9%88%E0%B8%8A%E0%B8%B2%E0%B8%A2%E0%B8%9E%E0%B8%A7%E0%B8%81%E0%B8%99%E0%B8%B1%E0%B9%89%E0%B8%99%E0%B9%83%E0%B8%AB%E0%B9%89%E0%B8%94%E0%B8%B5/246">Thai / ภาษาไทย</a></li>
</ul>

Read the comic Beware of the Brothers! online, along with others like The Beginning After the End, Solo Leveling, Omniscient Reader's Viewpoint, Jujutsu Kaisen, The Greatest Estate Developer, Revenge of the Baskerville Bloodhound, The Swordmaster's Son, After Ten Millennia in Hell, I’m the Max-Level Newbie, My Blasted Reincarnated Life

Adaptation

Comedy

Drama

Fantasy

Full Color

Incest

Long Strip

Romance

Supernatural

Web Comic

Beware of the Brothers!