Vera :
I actually watched it, its one of my favorite dramas of all time ^_^ but thankd anyways :)
Don't know if these would match, but they are more mature than bubbly love:
-Buang Hong (thai-the ML acts like a proper adult and the girl is spoiled but you can understand her and she's not rude like most spoiled characters. She's very kind hearted and develops pretty quickly)
-Cruel City (i hate it, but lots of others love it. Very mature concept; although I can't say the girl is 100% mature)
-Faith (actual adult relation-not much skinship though)
-FATED TO LOVE YOU (I LUV IT!! taiwan version is best then SK, don't even bother with the others lol- Taiwan really made good dramas back then! ><)
-Flower of Evil (hints of romance, married couple so not overly bubbly)
-Padiwarada (thai--> more of an innocent adult love set in an earlier age. I felt it could've been better. not really any skinship)
-Partner (an older kdrama. they bicker at first, but both characters even then are pretty mature. Both of them had adult life problems so they aren't that bubbly. I watched it long ago, but I don't think it had much skinship. Romance was subtle and not clear cut)
-Secret (pretty sure you've probably seen this; it's super popular)
-Duelist (a movie, not really skinship, but the theme has a mature love)