Both are historical dramas in which the leads attend school together. Both MLs are dreamer with big goals, one of the leads is hiding their identity, and there is a strong relationship between the leads.

Both MLs can see and interact with ghosts, both good and evil, and live with two or more friendly ghosts who assist them in their work. The FLs are in some sort of law profession (lawyer vs. police officer).

One is M/F and the other BL but both have the theme of three kids (two boys and a girl) forming a family. Later on, one of the "siblings" falls in love with another, but the other "sibling" is initially uncomfortable with it.

Both MLs are dessert chefs who own or dream of opening their own shop. Both FLs are foodies who enjoy what they make, and the two fall in love.

Both are short dramas in which the ML is a chef who makes food the FL enjoys. Both have a sweet and simple romantic vibe.

Both MLs are chefs who become close to the FL who tastes their food. Both FLs are in a profession where they are well known/famous, but struggle or had to quit due to a physical injury or mental health issue.

Both have a historical school setting, an endearing FL, and a strong relationship between the leads.

Both have an optimistic and strong FL, a ML who comes from the city, and a countryside setting.
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Both are fluffy and healing short stories with a beautiful countryside setting.
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One is BL and the other M/F but both have a city person ending up in the countryside and unexpectently falling in love with a farmer. Both are light, sweet, and have pretty scenery.

Both FLs enter a fictional world (game vs. novel) where they fall in love with an unimportant supporting character and must attempt to save him.

Both are mini dramas with a Republican Era setting in which the FL is out for revenge/to uncover the truth behind her family's death. She and the ML are both spies, something neither of them knows about the other.