Those who've read the novel

No

The story goes on much further.

Any idea if there's gonna be any side stories?

I hope so because it's really beautiful manhwa.i read it on a korean site and even after the story ended, there was a side story. But unfortunately, the side story wasn't on the site.valery and alexey go to Canada, they live together there, and Valery continues the ballet. The last episode is alexey goes to valery's ballet and they are very happy.(⌒▽⌒) even after this, the side story was still following me.even after this, it has a side story. I'm waiting for its english translation.