FL has another identity hidden in her that people fear. ML tries to protect the FL. Both couples have an unusual relationship of master/teacher or master/servant with an age gap between them. Fantasy/historical setting with many supporting characters.

Similar length, historical/fantasy setting, both are Chinese dramas. The main couple's relationship grows slower. Both ML's sacrifice a lot (and their hair turns white) to save the dying FL, then leave. Both FLs eventually find them again at the end.

Both are Korean dramas with a FL who can see ghosts and a ML who can help them in some way with their power.

Shorter Korean dramas with a ghost seeing FL and supportive ML.
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Korean dramas about a lead who can see ghost(s). The plots deal with closure and moving through grief.

Both are cozy, short, romantic Korean dramas about a love story between characters who've known each other for years, with one secretly in love with the other.

A group of people solving mysteries in a historical setting. Mix of drama and humor with a sweet feel.

Historically set Korean dramas. The main couple's personalities is similar, and the tone is relatively light and occasionally comedic.

Similar tone, historical setting, slow pace, and interesting characters. The ML's personality also seemed similar to me.

Historical setting, both are Korean dramas. ML and FL have a strong bond and good chemistry. ML becomes traumatized by the constant war. Surprising hopeful/happy ending after ML is wounded/near death and thought to be dead/possibly dead by FL.

Cross-dressing FL or ML, historical setting. ML loves the other regardless of gender.
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Both are cozy short Korean dramas, set in school at the beginning, and focusing on soulmates (DMN takes this in a fantasy way). ML initially seems distant to the other ML or the FL.