Where Male lead is not exactly a jerk or mean guy but is a tease and more like sarcastic.  He likes to tease female lead and is sarcastic but have a sweet/soft side. Oh, this may sound a little weird but I want him to dress cool or maybe gives off bad boy-ish vibes from how he dress himself, not exactly a bad boy but dresses cool and like that.

If there is little  romance between leads, it's okay! Romance not being main focus is fine as well! but I do want the male lead to fall first for the female lead and show interest first and like her first. it would great if he doesn't know he is falling or is denying and keeps thinking about her.

I know, this is specific and too much asked! 

Suggest me anything (dramas, movies,shows, webtoon etc!)

Oh, also I don't want female lead to be naive, dumb or annoying rather has a strong character!

No dark or sad endings.

THANK YOU! 

From what I have watched drama that fits your description is Hello Monster. If you haven't watched this you should! ML is as you described and acting is great. It's really interesting and thrilling drama. 

may be boss and me , love 20