I almost dropped at the first episode because I didn't read the synopsis well and thought that there was a...like HUGE age gap. Anyway, I still don't know how old are the characters, I forgot but it's not that bothersome. This is for the ones who are hesitating to watch this show... just watch it.
At first, you might think that it focuses too much on the jobs of the male leads, well it annoyed me at the beginning, but then I realized that it is interesting, and gives you an overview of what's going on behind products, advertisement, etc... This side of the show has an actual link with the plot which keeps it captivating.

The "fantasy" side of the show: the fact that they swapped their bodies, was an idea that involved a big risk: that the acting wouldn't be on point. That's why I left 9 stars for the acting because it was very nice but Na eun character in Eun Ho's body could've been more pronounced. Like... He was cold but not as cold as the original ... Anyway who am I to judge? I'm not an actor and I think that the role is very challenging but overall they are doing such a great job! Don't worry the show is still good
And about the plot, it is very satisfying.
I won't say more, otherwise, I would spoil something so I'll just let you watch it, don't drop it too soon(like, the first 6 episodes, btw they are 30 minutes long) I guarantee that it will get interesting!