This started gloomy then became fun then ended in so much tears.
I’m recommending that if you haven’t seen this series, 20 episodes is not too much to invest time on. You either like it or you don’t. Hang in there til episode 5 at least if the beginning is too slow for you. It gets better and then you’ll be hooked.

The ending left me bewildered and maybe someone can explain: she came back to the future and for a year have been dreaming of Goryo adventure. She sells perfume and the guy who looked like the Goryo astronomer came to her telling her what her last name means in Goryo time. Came across the museum and then realized she’s a reincarnation. Started crying. It ended with The portrait transitioning to Goryo period. That’s it. It’s not a happy ending folks, confusing ending to me.
Overall it is an excellent film - so enjoy.