I will try to explain it as much as I can (but I can't remember their names)
So Ash and John were roommates and friends since high school. Ash having an older sibling and family who are abusive and traumatize him so much. He also had a crush on John but kept it to himself.
One day, John found Ash masturbating and Ash uses the opportunity to flirt with John. Then they decide to be FWB but Ash seems to have a voyeurism/public sex fetish, and John little uncomfortable about it. Even though they are FWB, Ash wants a more intimate relationship with John. At that time, Ash met Noah, their apartment neighbor and confided to him about his problems with John.
John was jealous of Ash's closeness to Noah. However, he unexpectedly discovered that Noah was Ash's stalker, who was very obsessive about him. It was during this heroic moment of saving Ash that John revealed his feelings to Ash and they finally started dating.
But the plot twist is, Ash intentionally lets Noah stalk him. He even deliberately places a hidden camera so Noah can watch them do "it" (yes he still have that fetish) in exchange Ash's plan to make John jealous will success.
At the end of the story, there is another plot twist. John already knows that Noah has been watching them both (Ash and John) all this time. He deliberately pretended not to know so he could get close to Ash. But he also didn't want Noah watching them all the time. So John pretended to make a plan to get rid of Noah by pairing Noah with Ash's abusive brother without Ash's knowledge (It turns out that John and Ash's abusive brother have been talking to each other all this time).
I really hope you can understand...

a little bit of this, a little bit of that, a little bit of those ahh story line everyone is so fucked up