Same story, different adaptations.
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Both are mini dramas with an assassin FL who marries the ML under false pretenses in order to complete her mission.

Both are mini dramas with an assassin FL who marries the ML under false pretenses in order to complete her mission.

Both are mini dramas in which FL is a writer of a historical novel and the ML is a character there who magically comes to the real world, appearing in the FL's house.

Both FLs are writers whose historical novel is close to the end. Both MLs are the villains of the novels, who magically come to the real world.

Both FLs are in a coma after an accident and part of an experimental treatment where they enter a virtual world where they have a new identity and no memory of their past. The MLs who have been in love with them for a long time follow the FLs into the world but retain their memories.

Both have a lead who was once human in the past and then became immortal and has lived a long life to the present day, and the other lead who is human.

Both FLs discover their husband cheating on them with their friend, are pushed, hit their head, and die/are believed dead. They then get either a second chance at life or new identity and set out for revenge. Both FLs' husbands are unable to have children but the FLs are blamed. There is a man who secretly loves and helps the FLs.

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STH 2 is the sequel to the first film.
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Both MLs have feline characteristics and a group of close friends/allies who all work together. Both have minimal romance with a focus on friendship and bromance.

Both have animal-human characters, good fight scenes, and the ML's journey. Both have a similar feel.