I am so sorry, Lee Min Ho, but once again, I love you a lot more than I do your drama. (Are you turning into Kim Rae Won? I adore KRW but half his dramas are horrifying).
Personal Taste isn't bad but my biggest problem with it is the same problem I had with LMH's previous - the heroine.
It must be an age thing - when I started dramas, years ago, I rather liked the cheerful dim heroine. But the older I got, the less that trope appealed and by now I find it very wearying. There are some exceptions (aren't there always?) but as a rule, a drama with a dim heroine causing all sorts of situations through cluelessness, isn't going to be my cup of tea.
Well, if the drama was an action/period/revenge/etc drama, dimness of the heroine might not matter much - I would always be able to fixate on other things going on. But in a romcom, a heroine is front and center and if she doesn't click, nothing does. Not to mention I am more forgiving of dimness in a teen heroine than an adult.
I can see why you want to make her clueless - it's an easy source for comedic situations and creating bizarre twists. But honestly - when I compare PT heroine to heroines of other dramas I am watching, she makes me roll my eyes.
Still, it's early days and Son Ye Jin is an excellent actress, not to mention most dramas take some time to find their groove. Please get better soon, PT. Cutesy isn't really enough.