
Their actions are weird. I keep expecting them to do something smart but everytime they do dumb things.
It's like the author wants to make them smart but doesn't know how to

Exactly.
In the chapter where the uke was escaping from the building the author just cuts the part where he escapes to make him seem cool. But it didn't make sense as it was way too high up.
Also the CHP where the uke just gives the seme his contact info IT MAKES NO SENSE. You are a conman why are you giving your ACTUAL CONTACT INFO????

Hey can I read this without reading for your Love? Will miss anything?

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.
I am ready to fight