My Favorite Kdrama OTPs

Just what it says, my favorite Kdrama OTPs. Most important criteria is chemistry. Second criteria is how much I like them together at the end of the drama (do I like both of them as individuals and a couple and do I think their relationship makes sense). Third is the actors playing the characters because if I don't like one of them, I probably won't love the OTP. ***I've tried to put these in order, but really, several of them are TIES.