Big fan of GoAhRa, she plays her role pretty well in anything thrown at her. You are surrounded, Hwarang all good series to watch.
I have no complaints with her acting in this as well. A go easy stupid girl starts learning about the world.
Lee was also pretty good hilarious how even I was surprised by his roles age. He played character to the sleeve showing the kind of childish love but a mature exterior in the worldly things.
The support cast was brilliantly fit into the main story without them the story would not come along. It was very pleasant to watch till episode 14. It has the comedy, suspense, and love requires for the series. Till the big bomb dropped.

But even then it was pretty good the ML is written off as dead in episode 15 by the mother. But the nonsense was the climax the last 2 mins of the episode 16. I was ok with him dying also and that the FL was living with his love and memories etc.

Then he comes back from the dead what ??!!!
They should have either let him be dead or changed the way the conversation went between the mother and FL in episode 15 or atleast the reduced the time forward in episode 16. 5 F yrs, are you crazy who would believe that a guy u loved and mourned for 5yrs comes back from the dead.

Crazy stuff, my suggestion end the series 2 mins before the climax of episode 16 and u will go home with a satisfied series, though a sad ending but u will not lose the love u had for it for 16 episodes u watched