For people who’s criticizing Im Soo Jung’s acting, try to watch her other works: Chicago Typewriter, Search WWW or All About My Wife (the movie where she earned Best Actress Award). You will see that she’s a versatile actress.
Loving the casts and the OSTs. Haven’t seen Woo Shik in dramas after The Package. And I wish to see Lee Joon Hyuk as a support role instead of guest role.
As others have pointed out, in My Mister it isn't a middle-aged person macking on an almost-child because there…
I know perfectly well that there’s nothing sexual depicted in My Mister. I was just pointing out the age gap between the main leads, regardless of the ‘type of the relationship’ in each dramas. And I read lots of discussion about each of the dramas I mentioned above with all kind of perspectives. So I am not struggling at all thank you. We don’t even know yet what direction this drama will take us to, we just have to wait and see. But what we can understand now is that the main leads have a very deep emotional connection because of what they’ve been through. Just like in other dramas I mentioned above. And people make that kind of connection regardless of their backgrounds or age, as long as that person ‘gets you’.
K-Drama 
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We don’t even know yet what direction this drama will take us to, we just have to wait and see.
But what we can understand now is that the main leads have a very deep emotional connection because of what they’ve been through. Just like in other dramas I mentioned above. And people make that kind of connection regardless of their backgrounds or age, as long as that person ‘gets you’.