I love this drama so much cos I am always down with mature romance kdramas, I truly love them and rewatch them like a million times. This story is so beautifully made, moving between 2 time lines(with diff set of actors) so smoothly, you are never lost and everything fits so well. The pace is just right for me, not slow at all. If you like this, I recommend Beloved EunDong(3 time lines), Lost,
My Mister, Discovery of love, I need romance2, The Midnight romance in hagwon, Que Sera sera(2007) Another Ms Oh, Secret love affair. They are in same genre, sweet mature romance, some might have a bit of cheating done so sweetly that you begin to question your morality. I have discovered that looking for old dramas usually pays off. My Sweet mobster is another beautiful drama, it's still ongoing. Perfect Marriage Revenge is another great rewatchable drama.