Both feature a female lead character that has a strong relationship that seemingly will end up in marriage. However, that is not the case. "That first relationship teaches us more about ourselves than the other person we are in the relationship with."

Similar in the fact both:
- music themed
- male lead is an idol
- female lead & male lead cohabitate
- male lead has an ego issue

Both have a FL that becomes part of the band's family. In each drama two band members are serious about making FL their girlfriend after locating to a shared home in a neighborhood.

Joseon prince time travels to modern day Seol. FL takes care of him as he & buddies live with her as they try to find a way back.

Both dramas show a female lead character pining for a true love. The true love arrives via a magic book, however in Emperor or Boss that book turns out to be a prop in the end. Both transplanted true love interests live with the FL & are supported by them. One may be a cartoon hero & the other a prince, but both deliver love.

Both dramas have a plot that centers around saving a dying magazine. The magazine teams are passionate about their readers, processing a good product. & working with their teams.

If you are a dramaholic & have seen a few dramas.... when you watch a drama another one that you have watched pops into your head. As I was watching "Hello Again!", "My Fated Boy" came to mind. Both.....
-ML met FL as youngsters
-FL & ML are separated for some time before meeting back up
-ML aggressively & adorably pursues FL
-ML never loved anyone but FL
-FL w/ issues is helped by ML

Both Dramas have FL characters that are deeply in love with a male character that interacts w/them daily. Their betrothals to another man leave s them w/ questions on how to deal w/ their situations.

Both Dramas have FL characters that are deeply in love with a male character that interacts w/them daily. Their betrothals to another man leave s them w/ questions on how to deal w/ their situations.

In both dramas:
*FL & ML use strategies to overcome the hardships thrown at them by their enemies to get rid of them.
*The love hate relationship between the FL & ML lead them down a path of love.
*The FL has a strong devoted 2nd ML that starts as a love interest front runner (A difference - Story of Yanxi palace does leave you with the question of who the FL really loved for real, which to this day I still ponder on.....)

Male leads in both are troubled teenage boys acting out in immature ways despite the privileged lives that set them apart from kids their own age. The strong female leads in both defend the ML's in public which starts the whole love fest.

Both involve main female leads taking on the responsibilities at an Inn that requires classic Japanese attire to work there. Both have the Inn operator as a love interest. I found the humor in Promise Cinderella.... my cup of tea though....