Suga first love is music if you can read the lyrics of the song like his refferring to a girl of his dream but actually not a person but about how he love for music ..the hard things he encounter
The lyrics here are inaccurate and incomplete, that's why you didn't understand. So basically he's talking about a breakup, at some point in their relationship he felt lonely even when he was with the person he liked, so he compared their love to the color blue: sometimes beautiful but sometimes cold as well, he said that he doesn't need it anymore, he thought before that they were the perfect match for eachother, like the sun in each other's life but they unfortunately ended up fighting a lot, and right at the end of their relationship (breakup) is when he realized his true feelings and that it was real love after all, but it's too late now, their love story ended.
I want to ask something i searched in google and it showed that jw died in december 2019 but this song was uploaded in 2021 and jw's youtube channel is still uploading vedios. How?