For starters Wei Ying comes to mind from The Untamed he fits the bill perfectly. Open ending though.
Prince Lee Jae Ha in classic oldie King2Hearts is as free-spirited as it gets, while the FL is a stickler for the rules.
Where the ML in Shopping King Louie is light and careless, his lady is the grave and serious one.
Enrique Geum in Flower Boy Next Door is a genius creative director, who is good-looking, stylish and bohemian, and can′t get enough of soccer. For unknown reasons he falls in love with female Hikikomori Go Dok Mi.
Oh, and don't forget to (re) watch Fated To Love You Jang Hyuk wrote k drama history as the flamboyant eccentric boss falling in love with his mousy office lady.
