We're 4 chapters left until the end of the main story and I don't think this will have a side story based on the ending, but if it does have side stories, it might focus on Yura and Organ's life as a married couple. (Yes, they got married and even had a girl who looks exactly like Yura:> OR it would focus on Yoohyeon and Sumi (the kid who had a crush on him) who is now a college student and classmate of Yoohyeon.
I hope if there really is a side story, it would focus more on Yoohyeon and the Girl coz her memories of him got erased by Yoohyeon when she was a kid and now that they saw each other again, it might be a good start for another love to bloom hihi
P.S. Organ became the King