I don't mind if it's also secondary characters, as long as the girl is obsessed with the man. I'd rather this be historical dramas, but I don't mind contemporary dramas as well.

The Princess' Man might work

Love & Destiny

Bad Guy

ML is purposefully seducing women for his own goals/revenge,   resulting in some women quite obsessed.  ML comeback lines  to one too obsessed woman later on is really epic & a very memorable moment.


Chaloey Sak

Not really obsessed with ML,  but many many women totally obsessed to the point of psychotic obsessed with 2nd Male lead.



Chocolate

FL seems quite obsessed with a ML from get go that she only knew as child for a short bit.

Love Lasts Forever (jdrama) . A medical drama.

FL literally became a nurse because ML is a doctor lol. FL is so clumsy and ML is an expert in his field for years. You know where it goes. I love how even side characters have their own little backstories too. 

You should watch this, and tell me how you feel about it!

A Love So Beautiful - a school girl chasing a handsome top student

Its Okay to Not be Okay - kinda creepy, woman is definitely obsessed