Question

FYL came first. It includes that couple in some chapters, but not so much you'll feel you're missing anything.

Can you tell me the important part that connect FYL and FOS? Like I read the synopsis and mc here is there teacher?
What about the ML is he friends with FYL characters?

Mr. Lee was Yuri & Yohan's teacher. Yuri was the snarky sidekick character. Yohan & Mg are boyfriends, and Yuri visits them in their college apartment.

I preferred FYL, but I don't think you'll miss anything beyond Yuri hanging out in the faculty office with Mr. Lee and stapling papers. Yuri's romance with Mr. Lee doesn't begin until this story, so you won't miss too much if you only care about Yuri.

FYL focused mostly on Yohan. There IS at least one scene where Mr. Lee is looking at the same photo in FOS and might be more, but it isn't pointed out; his role in FYL is literally just their teacher.

Thank you. I do also want to read FYL but right now looking for a slightly dramatic story.

I understand :)