If you're looking for manga similar to I'm Engaged to an Obsessive Male Lead, you might like these titles.
I’ve been reborn as Clea Rino, the world’s most wicked villainess! Before her death, Clea made a deal with the Demon King to marry her true love, Isaac Detroi. To get my life back, I must fulfill that contract for just six months. Guess I didn’t read the fine print, because her body is weak. I lose 1 HP with every step! With time ticking, I’m signing over her family’s fortune for Isaac’s hand in marriage. It’s purely business, so why am I catching feelings? Who knew this villainess had a heart?
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Both are isekai shoujo manhwa where the protagonist is terminally ill and enters a contract relationship with the male lead.
The original Erica was written as the pitiful ex of the novel’s male lead, Reo. Now that I’m her, I refuse that pathetic side role, and I’ll cast him aside first! But then again… the way he looks at me, with those gentle eyes… No! I must stay strong. All the male leads fall for Juliana anyway. I can’t compete with her (she’s the protagonist!), but it feels like these men are throwing me into the ring! Should I let the plot run its course or save a few broken hearts and give my destiny a rewrite?
Ninenya Seiah’s misfortunes began from birth, owing to her mother’s traitorous reputation and subsequent death. Ninenya was thus banished from the noble Seiah family and forcibly separated from her father, Lord Rubenio Seiah. In extremely poor health, Ninenya has mere months to live. To save his daughter, Rubenio enlists the mysterious Count Adelman as her protector. Ninenya must now work with Adelman to improve her poor health and stop her from becoming the victim of a deadly family feud.
Rinha, Korea's most beloved actress, gets into an accident while on set. When she regains consciousness, she realizes she has traveled to the Kingdom of Iklein and meets the northern duke Calcion, who saves her from a demonic beast. Calcion asks her to be his fake lover so she can get into socialite and discover the conspiracy happening in his castle.
Sielle is an ordinary handmaid working for the Grand Duke Ferzei Yekarte. The thing is… she knows he's a villain of a story she read in her previous life on Earth. With her prescience, she managed to foil an assassination attempt on her master, only to be framed for the crime! Worse yet, when she drank the poisoned wine to prove her innocence, she turns into a little girl... And now the Grand Duke wants to ship her off to a notorious family of assassins? Will she manage to survive through all this, even if she knows how it will all end?
Ever since being transported into the world of a book she read, Leana has had one goal: stay on the emperor's good side and avoid being sent to prison! Sure, she agreed to marry him and become his empress consort for a pampered life of luxury, but she's determined not to make the same mistakes as her antagonistic story character. But for some reason, things in the story keep changing -- new characters, unexpected events... Can Leana get this story back on track, or is she in for a plot-twist?
After meeting her death, Thalia is reborn as the female protagonist’s older sister, a character that never existed in the novel she wrote in her past life. She tries hard to get attached to the world inside the novel, but she gets caught up in the thought that everything is just a mere creation of her own. “Please make Tilly love me.” Aegis, who was supposed to fall in love with Thalia's younger sister, makes a wish to God on his coming-of-age birthday. Will Thalia be able to love Aegis?
Poisoned to death by her own betrothed?! Eunha didn’t wake up in a novel’s story just to get killed off again as an unfortunate extra! To change her story she needs a cover… 6 months pretending to be the fake fiancée of the novel's male protagonist, Duke Noah Wynknight. But will this cold-hearted, angel-faced demon of a man really help her avoid another ill-fated ending?!
Hildea Hillington, the daughter of duke Hillington, always knew that she was a mere supporting role in the story. She also knew that her destiny was to watch her younger sister, Roserielle, get married to young and ambitious duke Gabriel Velkius. But something was definitely off. Why does Gabriel say that he loves me? He's supposed to be in love with my sister!
To flee from her abusive family, Evelyn Diego pretends to be a goddess from a prophecy and tricks the blind Grand Duke Devan Lantimos into believing she can lift his curse. Unfortunately, her powers fail to heal him completely, and things get even more complicated as she discovers that Devan's curse isn't quite what she thought it was. With time running out and her family looking for her, will Evelyn be able to cure Devan and get the freedom she so desperately wants?