What i meant by a side story is a whole new story about Dohyeok (which is technically the side story of the main story. And in BL manga world, there are side couples getting their own stories later on. Ex: Kiraide Isasete Asanaga sensei to Yanagi sensei) in the future !
I reacted that way because it was an unexpected ending for me that’s it.
Like someone said in the comments “what’s the point of this side story if that’s how it’s going end ?” Because now we have a lot of questions about the future of Siwoo and Dohyeok.
But at the same time, this ending could be the author’s choice to mirror the real life, where we don’t always get the answers to our questions and we have to keep going.
Anyway, next time keep your ignorant comment to yourself

Sooo ! the story ended few days ago im actually quite content with it. But i feel like there’s probably gonna be a side story with Do Hyeok but i could be wrong