Both FLs suffer from sleeping problems that can only be cured/treated by the ML, resulting in the two living together. Both couples work in the entertainment industry.

Both dramas have a similar vibe and a very similar ML. Both MLs are skilled fighters with a group of men who follow him, and the FLs both survived some traumatic event that resulting in the leads becoming separated for several years.

Both couples end up platonically living together at the beginning (as a contract couple vs. step siblings) and then fall in love, only to (wrongfully) learn they may be biological half siblings.

Both are mini dramas with a wealthy, ill (mentally vs. physically) ML who becomes involved with the mute FL. Both have scheming, evil relatives who cause problems for the couple.

Both MLs are wealthy and have trauma-related mental illness and FLs are their employee or contract wife. The two fall in love, and the FL helps the ML begin to heal. Both MLs have complicated relationships with their grandfathers who raised them after their father's deaths.

Both dramas are about someone creating a robot to "replace" a beloved family member who is missing or they are separated from. The robots end up having a special bond with the FL and save her from a fire early on in both dramas.

Both are historical mini dramas in which the FLs die and are reborn in the past, using their knowledge to change the events. In the process, they become close to the ML.

Both FLs are seemingly killed because of the royal court in ancient times, only to be reborn in modern day and decide to change their fate.

Both FLs are betrayed and murdered in the royal court in ancient times, only to be reborn in modern day and decide to change their fate.

Both MLs are very messed up with a dark secret and both FLs are cheerful and positive despite a hard life and MLs view them as the only bright thing in their lives. There is a SML who seems to have a crush on the FL and is very suspicious of the ML, viewing him as dangerous. Both are slightly disturbing romances with an unsettling feeling.

Both are about a close knit trio that eventually becomes a love triangle. Both MLs and FLs were neighbors in an apartment as children, and then the MLs were abandoned by their mothers who went on to have another child. Both MLs are very attached to the FL and the FLs are spirited and outgoing.

Both are set in school with a warm, nostalgic vibe, and a close but bickering relationship between the leads who live in the same apartment building.