Nope, because I didn't even know about Lover Boy till now and I've understood the plot just fine haha
Thank you for telling me!
Only if you're interested in his past, why he is the way he in now
it doesnt worth the pain and suffering of reading lover boy (unless you likenthe depressed twisted vibe manhwa). You just need to know that the seme of this manhwa is the side character in lober boy that used to love the uke of lover boy for years but he was basically only got used as a sex object by the uke. FWB, his feelings never mattered to the uke of lover boy he just needed someone to fuck him basically and ended with other seme. That is why he is very guarded here. He changed a lot and never an asshole, just kinda cold and guarded towards his current uke aka boyfriend. Not anymore after he realize his feelings toward the current uke tho.
Knowing this only is enough.
Do I need to read lover boy to understand this?