Fall for You (2022)

It has the same concept that the FL is playing the role of an extra in a Noval/Manhwa

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{Finally I found something similar to Extraordinary You (????? ?³???)?? my all time favorite kdrama (???????)}

Office worker Ye Wan Ge got involved in a car accident and woke up to find herself transformed into a character. Ye Wan Ge thinks she can return to reality if she sets up the male lead, Feng Mu Chen, and the virtuous female lead, Lu Wan Qing, together. After failing time and again, Ye Wan Ge realizes that she can only truly leave after completing the life quests in the story.

The FL in both drama accidentally travel into the novel they were reading, becoming the vicious second female character

both fl are transferred into a novel and are trying to avoid the ml of the novel
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both fl are transmigrated into a novel
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main character getting ''forced'' into a ''game'' both high school romance kdramas
kpop idol(s) cast

both fl are transported into fictional worlds
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A Drama that has the same actor as the Main Lead. If you like him here, you may like him there, since the story both center around school romance.