try Rusty Quadrilateral
trapped (Olgami)
Yunsu and Chae‑a start with blackmail and murder accusations and slowly spiral into an intense, enemies‑to‑lovers, yandere‑heavy romance. She’s an ex-con, he’s a vampire, and their power struggle drives most of the plot
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340 Days
Part of a world where people are either “Destroys” (violent killers) or “Shuts” (emotional). Lin falls in love with Dosung, a literal murderer. Despite the twisted setup, she loves him unconditionally—and he’s just as obsessed
DEWILDESALHAB武士
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Dreaming Freedom
High-school drama meets lucid‑dream vengeance. The male lead builds up from a dream but evolves into a deeply possessive, protective yandere. Not quite partners in murder—but intense obsessive love with violent undertones
Reddit
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any romances with a murderer x murderer or just a couple that commits crimes together