Read manga: Flowers of Evil (Manhwa)

Manhwa
Summary:

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?

This manhwa contains incest themes.

Title comes from French poet Beaudelaire's compilation of poems, Les Fleurs du mal.