And for users who wanted to select non-binary option from South Korea, you can use https://www.spotify.com/us/ or other else country to select it. Even you sign up there, because Spotify checks the actual location, so it would be signed up as South Korea.
...and also after doing that, I could found that the option for gender comes with "male" from the server. (Just users who didn't use Developer tools on browser couldn't see.) Tell us why this is happening, and PLEASE add Non-binary option back.