Both dramas have a fashion designer FL and one of the leads has some personal trait (in MLEM the ML remembers everything, in CA the FL is colorblind). Both dramas are very tropey and light.
Both are set in school with a rich ML/poor FL. The ML's mother disapproves of their relationship, and there is a rich SFL who is engaged/planned to be engaged to the ML. Both dramas deal with school bullying.