Both leads are isolated due to trauma, with both MLs working hard jobs. Both stories have a melancholy but healing tone.

Both are slice of life, mellow stories with a blind FL.
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Both are mini dramas where one of the leads had a crush on the other in high school but something went wrong and the leads never got together. In the current day they end up on a reality tv show with a love triangle between the FL, ML, and SML.

Both have cohabitation between the leads that becomes a romance. The MLs are distant and highly intelligent, approaching everything mathematically/scientifically, FLs are naïve and sweet.

Both dramas involve a contract marriage between a couple in order for the ML to make his ill grandfather happy,

Both dramas involve a contract marriage between a couple in order for the ML to make his ill grandparent happy,

Both are dramas about a contract marriage that becomes true love between a poor FL and a rich ML. Both MLs marry in order to appease their grandparent.

Both dramas involve a contract marriage between a couple in order for the ML to make his ill relative happy,

Both dramas feature an arrange or forced marriage in which the FL initially doesn't like the ML and continually makes things difficult for him. Both are light historical dramas.

Both are mini dramas with the same actress as the FL, and in both she's a strong and domineering character. MLs are weaker or subservient and "belong" to the FL.

Both FLs time travel to the past to kill the ML and prevent their world from being destroyed by him. Over a series of time travels or lives, the FL falls in love with the ML. Both MLs are morally gray and misunderstood.

Both dramas have the same actor and actress paired as the main couple, so if you enjoyed their chemistry in one, you will enjoy it in the other.