Some writing prompts (updation in progress)
A girl kills her husband for her boyfriend and chops him into pieces and throw the pieces into sea. An year later, she goes on a sea cruise with her boyfriend turned husband for honeymoon where a charming man seduces her. What she doesn't know is that the charming man is a merman who feed on humans.
A guy in his 30s meets a woman in a deserted road at midnight after returning from evening shift at work while he walks to bus stop. They meet each night, and only talk. But a bond starts developing between those two though neither gives the bond a name. Later it's revealed the woman is dead and is the ghost of a girl who had a crush on ML during teenage when he was one class senior to him and gave tutions to her. Then ML got transferred. When ML came to town to meet his old friends, the girl ran in heavy rains to meet him but he hadn't seen her. Dejected and rain drenched, the girl caught fever and died in a week.
A lazy, good for nothing lawyer who takes the case of a poor man against a powerful hospital (as no one else was touching the case) is killed before he could confess to his crush. The guy gets reincarnated in a rich family. But when he becomes 25 year old, his crush is 50 yo.
A girl who thinks her neighbor's nerdy son is not her type is entrusted with the neighbor's son to make him hot enough for his crush to notice. Instead the FL begins falling for him herself and starts sabotaging the whole thing and presenting the boy to his crush as a Casanova.
For second, a girl loses her bf in an accident. By her aunt's/uncle's chaotic experiment, she gets transferred to another world where her bf has completely different personality in this part of multiverse and he doesn't love her.
A poor friend is jealous of his kind rich friend's life. So he plants drugs in his pockets during farewell party and gets him arrested and killed and usurps his family's wealth getting his father paralyzed and emotionally blackmailing mother and marrying his sister. The rich friend is reincarnated in a poor household with his memory intact and worms his way as his best friend's right handed man.
A dark romance loving FL gets married to a boring ML who is smitten by her. To impress his wife, he pretends to act like an alpha dark romance ML with hilarious results but somehow the wife starts believing he's exactly like dark romance alpha ML whereas he is more like a character from Panchayat web series in real life.
A go getter chaebol girl gets possessive and obsessive over a scholarship student and then betrays him after she gets bored.
A cop with a happy family is engaged in a cat and mouse game with a serial killer only to find out the serial killer is their dissociative alter ego/their spouse.
Two pen pals-FL and ML who don't know each other's real identity--before meeting for the first time, ML meets an accident and FL could only see the truck hitting him and the news of an unclaimed dead body. Later ppl realize that ML's heart is beating and get him to hospital. He loses his memory. Some one adopts him or something like that. He gets into arranged marriage with FL after some years. Both feel a bond, but don't know why.
An undercover agent uses drug kingpin's spoiled daughter to get revenge on the drug kingpin who killed his parents.
A rich girl and poor boy fall in love in medieval times but poor boy is killed as punishment. In modern world, one of them is reincarnated and other is an immortal raven shapeshifter.