http://mydramalist.com/12466-mondai-no-aru-restaurant
http://mydramalist.com/11936-dakara-koya
http://mydramalist.com/6004-yakou-kanransha
http://mydramalist.com/2751-is-otoko-demo-onna-demo-nai-sei
http://mydramalist.com/277-cat-street
http://mydramalist.com/5992-saikou-no-rikon
http://mydramalist.com/2662-soredemo-ikite-yuku
http://mydramalist.com/264-orange-days
http://mydramalist.com/7188-woman-2013
http://mydramalist.com/5691-tonbi-2013
http://mydramalist.com/5136-i-will-fly-to-the-sky-on-a-wheelchair
http://mydramalist.com/7871-kyo-no-hi-wa-sayonara
Korean dramas that deal with the theme of adultery & redemption:
Valid Love,
Secret Love Affair,
A Wife's Credentials. They're all mature Kdramas that aren't plastic or shallow, so I'd rec them if you want a story that's more about relationships and life rather than a clichéd love story.
Oh, and
Incomplete Life is also a must-watch drama for anyone who's lost faith in Kdramaland and wants something a bit different.