Melon is literally one country and the users ain’t nothing compare to Spotify that counts multiples countries.
My theory is Melon streams count by seconds unlike Spotify ones or is just Korean fans streaming culture is another level because there is no way.
Recent example is NCT 127 Sticker with 7.1M streams on Melon and 2.7M on Spotify so far, international nctzens are getting beat up by knctzens.