-Both medical dramas
*Doctor John is much more medical focused though
-Female lead is there to help male lead through tough times
*Can't say much so as to not spoil
-Just a similar vibe between both dramas
*Especially with the music
In general both are really good dramas and I would 10000% recommend you give them a shot

I feel that the male leads are similar to one another and have similar aspects. Also the whole feel/vibe/atmosphere of the drama is similar in my opinion.

In both dramas...
-Female and male leads are in an older women younger man relationship with both guys being in high school
-Second male lead also has issue with his father
-Male lead and second lead's father have issues