this isn't based on my favorite kisses but actors ive seen kiss good again and again.
godfrey gao - pretty much amazing in every kiss scene he has done. odd perfect match has the best first kiss ever. I mean just look at this -
http://hkctvdramas.tumblr.com/post/50302829276/every-girls-dream-to-be-kissed-and-held-by
jung il woo - always kisses great
lee min ho is a good kisser but he has been given a few crappy female leads.
also joe is for sure one of the best kisser. ive seen almost all his dramas and he has lots of good kiss scenes. the best being the honeymoon scene in they kiss again ep1. they are kissing for a good 5 mins and there is no background music, wow that scene was good.