Flowers of Evil

Flowers of Evil (악의 꽃) is a seven volume manhwa created by Lee Hyeon-Sook in which siblings Se-Joon and Se-Wa are a bit too... close to each other.

Se-Joon and Se-Wa are siblings with a dark, complex relationship. Se-Wa, a girl considered psychotic by others, is attached to her brother... a little too attached. In her eyes, there is only Se-Joon, and no one else. And what of Se-Joon's feelings?

Tropes used in Flowers of Evil include:

• All Love Is Unrequited: Se-Jun says loves his sister as a sibling, though sometimes his behaviour hints at feelings which mirror hers.
• Alpha Bitch: Whats-her-name claims that she saw Seh-Wah push afro-guy down the stairs with her own eyes.
• Big Brother Attraction: Se-Wa as a teenager.
• Bishonen
• Brother-Sister Incest
• Clingy Jealous Girl: See 'Yandere'.
• Disproportionate Retribution: See 'Yandere' as well. Poor afro-perv-guy...
• Downer Ending
• Driven to Suicide
• Everything's Better with Princesses: Se-Wa's nick-name around school is 'The Ice Princess'.
• Father, I Want to Marry My Brother: Se-Wa as a child.
• Green-Eyed Monster: Jealousy and envy are the roots of all 'yandere' in this story.
• Incest Subtext: Se-Wa is both vocal and forward about her feelings for Se-Wah. His feelings about her are conveyed more subtly. At first.
• Love Triangle: Actually, more of a square.
• No Export for You
• Played for Drama: The premise is about two twins who want to jump one another's bones. Just another run-of-the-mill romantic comedy where it turns out they're not siblings after all, right?
• The Reveal: Seh-Joon pushed Afro-guy down the stairs. He's actually more of a yandere than Seh-Wah is.
• She's All Grown Up: We are treated to a few shots of the twins when they were younger. Thing is, now that they're older a lot of the things they used to do together are not okay anymore. Like, sleeping together. Or bathing. Or kissing.
• Sins of Our Fathers
• Unlucky Childhood Friend: How Se-Wa sees herself with regards to Seh-Jun.
• Unresolved Sexual Tension: Seh-Joon and Seh-wah. It gets resolved, eventually. This isn't a good thing.
• Wounded Gazelle Gambit: See 'Yandere' again.
• Yandere: Seh-Wah, and 'Gi-Hoon's' ex, Soo-Jin. Seh-Joon takes the cake, though.
• You're Insane!: Seh-Wah gets this a few times, most notably in the aftermath of her asking Seh-Joon to prove his love by dying for her.