I like the fact that when Hye Jin hugged him, Du Shik didn't spend 30 minutes being shocked by her hug. Sure, he is a bit surprised but he quickly recovers and hugs her back as if it was the most natural thing in the world to do.
They're not even dating guys.
In most k-dramas, when one of the main lead hug the other, the other lead usually either stay stunned for an insanely long amount of time before reciprocating very hesitantly or they don't respond at all.
I've even seen cases where the leads already were in a relationship and the one getting hugged didn't even respond??
Of course I understand if it's part of their character to be like that but, most of the time, that is not the case. I don't know about you guys but if someone I care about hugs me, I hug them back.
So, to see Hong Du Shik returns her embrace so easily, as if he had done so a million times, that was truly refreshing.
I feel like the acting in this drama is much more realistic than others, they don't tend to exaggerate their reactions and instead we get to see the characters's micro-expressions. This, in my opinion, makes the show more enjoyable to watch and you can appreciate the characters's reactions more, especially the big ones because it helps the viewer realize that what happened has truly impacted them.