Devilish Joy, wooo baby.
There's also a pretty shocking one in The Rose that stays with me years after I've seen it. But that's Taiwanese.
Her Private Life, that was a good one.
The first episode of My Secret Romance... but that drama falls right off a cliff after episode 1
There's incredible kiss scenes in Extremely Perilous Love, but that's a chinese short-length drama. Still, I'd recc that drama to anyone, the ML is absolute FIRE.
EDIT: Right now I'm watching Lie To Me, and holy lord, add that one to this list too. There is so much hidden kilig in this drama, I LOVE IT <3 The first kiss is excellent.