Kdramas with ML like the one from ‘Happiness’?

After my last post, I decided to binge watch happiness and safe to say it’s one of the best kdramas ever! I love how well written the main leads were and I was wondering if there were other kdramas with the same type of ML? Like the green flag trope where he’s willing to sacrifice his life for FL and is heads over heels for her? Maybe similar to MGT from Its okay to not be okay