This part: IS a flashback of the first chapter of season 1, when Jung invited Sul for a meal for the first time I'm assuming it's not black anymore because it's so close to the present. The flashbacks are more colorful depending on the timeline, really old flashbacks are black and white, and the closer they were to the first chapter the more color they had.
I´ll publish the english translation of mangas I like to read that I can´t find in english. I won't be taking requests, else there won't be an end. I also don't have a release schedule I'm not a group and I ask you not to pressure me too much, I do it because I want to. I know I´m slow ¯\_(ツ)_/¯