This is one of those odd shows that I quite enjoyed, especially first time round but is actually quite pants.

Let's face it, for me, Kim Sae Ron is what makes this watchable. Her character isn't bad, she can act and she has a great face for comedy managing to go from pretty to cute to weird and back again in the same shot. The fact she's only 14 makes things a little awkward because she absolutely looks her age which made the 9 year age gap a little too cringey. especially in the last couple of episodes.

The Infinite boys were OKish but neither had the acting chops to carry it off, cute moments are easy enough to manufacture but they need some glue to make it really work.

Add to that a plot that lost it's way at the half way point and made some of the characters into really terrible people it was hard to care for and little side character development. As well as a rather too schmaltzy way of tying things up both at school and later.
You get a 'could have been great' show.

I've watched it a few times now on my own and with the kids and I still get enough enjoyment out of it to skip through and watch the cute/funny bits.
It really isn't a great show though