sadiesmith

" Lee Sun Kyun just has a look that breaks your heart and warms it at any given moment. His empty stare and heavy sighs echo louder than any of his yells, and each tear he sheds feels like a waterfall."

What nice contrasts. Loved the way you described his acting. Come check out this drama's fan site if you haven't already: https://givemeslippers.wordpress.com/

Because that's his very nature, his very essence.
https://givemeslippers.wordpress.com/2018/07/08/the-quintessential-stoic/

May I direct you to this interpretation of the two finally found happiness with each other?
https://givemeslippers.wordpress.com/2018/06/23/my-ahjussi-ending-a-promise-of-more/
And this one discusses the marriage: https://givemeslippers.wordpress.com/2018/06/19/dong-hoon-yoon-hee-did-they-divorce-or-not/

Good to know I am not quite the only one. The good thing is I have only watched it in its entirety two times, and now that I am starting my 3rd slow re-watch, it does feel sort of fresh. I'm not quite done with the fan site either.

The ending might seem open and ambiguous, but if you look closely it is not so open:
https://givemeslippers.wordpress.com/2018/06/23/my-ahjussi-ending-a-promise-of-more/

You are so NOT the only one. Check out this fan site for lots of My Ajusshi info and analysis: https://givemeslippers.wordpress.com/