If I'm not mistaken, one of the Roshi (Zen masters) once said, "When you master one thing, you master everything."
When we pursue a hobby and delve into it, sooner or later we realize that it's connected to everything else.
I think Shun was lucky to meet Chokki-senpai, because someone who wholeheartedly appreciates your hobby and understands you without judgment is a wonderful thing.
That's also a rare thing.
So, if you find someone who makes your happiness her happiness and your sadness her sadness, then you have found the right person.