Similar:
-older woman/younger man
-FL is ML's senior at work
-ML is the son of the chairwoman
-rich and playful ML
-ML hides their identity at work and start as bottom level employees
-both shows are romantic comedies
-ML is madly in love with FL
Differences:
-In WWL the ML's mother is not that against their relationship (in CA2A she actively works against it)
-In WWL the ML does not want to inherit the company and is working to get kicked out (CA2A he doesnt mind working at the company)

In both dramas...
-Older woman/younger man theme, the age gap is about the same as well
-The ML is a musician
-The ML is famous whereas the FL is an ordinary office worker
-The leads grew up with each other but grew apart when the ML moves
-The FL doesn't consider the ML as a love interest at all
-ML falls in love and chases the FL first

In both dramas...
-Wu Nien Hsuan is the ML
-Older woman/younger man theme
-The leads are childhood friends
-FL is recently divorced
-FL returns to Taiwan secretly without telling their parents
-There are love triangles

-The age gap in LIS is much larger than MM

In both dramas...
-the FL gets romatically involved with the ML to get revenge for their family.
-an overbearing mother that is controlling over their son
-battle for inherenting the family's business
-ML falls for FL first, and FL is blinded by revenge to admit their love

KKSR is more comedic while WWDS is more serious

In both dramas...
-the couples have to fake a marriage due to a scandal that will ruin their careers
-the couples go from hating each other falling in love with each and not minding being married
-celebrities are involved in the relationship (both actors) on Well intended love its the FL and in Please love me its the ML
-the couples have to move in with each other to protect the details of their fake marriage
-there are love triangles, but they resolve themselves pretty quickly
-the FL is friends with the people who are apart of the love triangle
-the MLs are both cold at the beginning, but they slowly warm up to the female lead

Both dramas take place in a office and has the male boss/ female employee theme.
Both female leads like the male lead first, but quickly change their love into hate. The couples end up together in the end.
On a side note, both female leads have a poster of the male lead in their room.

Both male leads are major germaphobes and make the companies they run do insane procedures to keep it clean, but they slowly change upon meeting the female lead. Both female leads are strong independent women. The shows also share the theme of Rich Man/Poor Woman.