I really loved Woman of Dignity and rated it higher than any drama ever. Gave my first 10/10...but the dramas that stay in my heart and sing to me, that I re-watch often, that I wonder about the characters and how they'd behave, long after the drama is finished are:
1 Faith
2 Healer
3 Mary Stayed Out All Night
4 Moon Lovers - Scarlet Heart Ryeo
Faith and Healer are both by writer nim Song Ji Na (my favourite writer - it might also be good to look up A Man's Story and The Legend - two more of her dramas that are also brilliant but rewatch value isn't high)
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(Moon lovers is a bit different to the others mostly because it's beautiful, i love the music and i have a theory about Hae Soo that i'm sure might eventually result in essays. basically i don't just rewatch for love.)