Are there any bls where the couple is in a secret relationship. And the whole plot of the story is them trying to hide that they’re in a relationship?
Not really but due to their complex relationship they hide it.
https://www.mangago.me/read-manga/love_or_hate_yeongha/
https://www.mangago.me/read-manga/kono_kiss_wa_kiji_ni_dekinai/
Seme was an actor. So you can guess.
A Bl where the couple bickers a lot and act as if they don’t like each other.
Crossing the Line (ongoing). roommates can't stand eachother but they ended up as fuck buddies
You and I can't do this. They're offices workers who fight at work all the time and a mutual friend accidentally introduced them to eachother
Unmei no Tsugai ga Omae da Nante. Omegaverse (can't rlly remember how it started but they're coworkers)
Muri Marriage. MC is ask by his parents to go visit his hometown only to be told he's gonna be married the son of the chief from the neighbor town.
Assorted wildness. This one is a rollercoaster with a guy who is fearless and somehow gets involved w this mafia guy. It's rlly funny
The devil's temptation. This one I don't remember much but they're coworkers and the ML is in love w the MC but loves to get on his nerves
Zanzou Slow Motion. This is a spin off of a 2vol series (tbh you should check the entire series, it's amazing). The president of the cinema club and a 2 year student are both directors and clash constantly, not too long after they unexpectedly become roommates
I definitely have more if you'll like

Ok, so the only thing I remember from it was that it was a friend’s with benefits plot. It was just so stupid and deranged. The only thing I can recall is this scene where the two dudes are on a movie date, and I think it was the seme who goes to grab popcorn but he’s actually(somehow) touching the guy's dong. And says “MM Tasty” something like that. I honestly want to see if it’s still on here just for the shits and giggles.