Playful Kiss "Moistly NG"

I was going through all the BTS and NG's of Playful Kiss when I did see this

 short video again of this NG.

I can't help but laugh out loud when I did saw this the first time!

In this NG video, the director (I think) was asking Hyun Joong and So Min 

to look "moistly" to each other as Hyun Joong would say the most 

loveliest declaration of love for Oh Hani in the scene.

What makes this NG so funny was the fact that even Hyun Joong and 

So Min can't seem to get the moistly look done!

But by the way, what does the director really means when he did say moistly?

And why we didn't get to see the scene when they look moistly to each other?

Hmmm...

credit: purfyoom of youtube

          mbc