I have some plan on what to write, but it might change over time as things might be different based on ideas being added or removed in general.
Here's some of my ideas.
Crossovers/Merge:
-Viral Hit(I am planning to add it because it was written by the same author but I am not super familiar with this Manhwa, as I only read approximately over 50 chapters. So I have reread it again.)
-Nisekoi (want to involve this story and have Raku as a strong benefactor/ close friend
-Golden Boy(But only certain characters and plot elements as I have something written for the MC)
-might add more depending on whether I feel it fits and it blends well together.
-Hajimete No Gal (Minor elements added only)
-Great teacher Onizuka (Minor Elements added only)
-Amai Saiketsu (Possibly but the story would not be a strong focus)
Arcs:
-Childhood(Age 1-12)
-Learning Martial arts/tournament
-Learning other instruments/making Music
-Travelling to Japan for visit
-Middle school(Age 13-15
-Fighting off bullies and others
-writing a light novel for money/performing and making Music.
-High school(Cannon start)
Theses are some of my plans for now. Leave any suggestions or comments below if there's something you want to add or feel like you need clarification.