
There's a high possibility it's not step bro, cuz the minhyuk guy was also wearing a white t-shirt underneath his blue sweater, and it might be author misleading us, cuz author-nim specifically pointed out him being weird with how involved he's getting with their project, he's acting "off" and the dress thrown around is not showing any black pants only beige/brown, which can point out to the Sunbae 's cardigan and the other's pants(which is brownish). And once Mc saw this stepbro will pop up and say along the lines of *tsk tsk, look what we have here, how scandalous, U mut be heart broken he's cheating on U" and then proceed to console him. Cuz step bro won't be able to get Mc if he's the one f-ing MC's bf, it wont make sense since they are kinda on a good bro term with each other, so if Mc got his heart broken and broke up with Sunbae, who do U think he'll be running to---> (づ ̄ ³ ̄)づ step bro~ for sure and he'll console him with sex and manipulate him further into being dependent on him... And step bro will be like "see I told U, U only need me~" along those lines.
Just my 2 cents from seeing it, but I ain't still fully- reading it lolol

Honestly saw this from a mile, the moment I saw Sunbae he exudes bottom material, and I was just waiting for him to get railed by some top or I guess in this case by the only top we have here (the stepbro), but I ain't reading yet until I see the whole picture and just let it marinate for now and just see the comments on what's up before fully seeing the drama cuz there's only one way this can go... Which is 2 people f**king -or 3 lolol you can never be too sure in this one lol ╮( ̄▽ ̄)╭

Honestly there are 3 things that I can think of:
1) Woojin hypnotize and fuck Wooyeon and have the Sunbae watch them "accidentally" so Sunbae breaks up with Wooyeon. ┗( T﹏T )┛
2) Hypnotize Sunbae, fuck him and have Wooyeon see it, break his heart and stuff. ( ̄ε(# ̄)Σ
3) Woojin straight up tell Sunbae about him and Wooyeon. ╥﹏╥
4) or we'll have the one we got from the promo(w/ the parents , but instead it's Sunbae who's watching lol) where Woojin hypnotize both of them then break the hypnosis with Wooyeon first and then blackmail him in breaking the hypnosis of Sunbae making him see/realized the brothers are fucking -leading us to scenario 1...(╯°Д °)╯╧╧
Any other predictions y'all.??? (⊙…⊙ )

Honestly, I dont like black haired girl and the short blonde dude and the prez, they kinda annoy me like they're the type of people who try to impose on you..? Or like force U to do stuff and make U feel like it's ur fault if U didn't do it, or like acting all cutesy telling that U r theirs and blaming U if U made contact with others, acting all tsun tsun but still clings to U like it's freaking annoying aaarrggghh, I just wanna smash their faces with a shovel, and don't even get me started with the black haired girl, girl thinks it'll work her way cuz she thinks she FML and she doesn't need to do anything and Mc will magically fall for her like one of those shoujo, well this BL and not shoujo..
AaaaAAAAaaARrRrGgGgGggghh , idk man maybe it's just me, and or those 3 characters have too much screen time and the rest have limited screen time that I don't feel quite annoyed with them, just the personality of those 3 are not giving for me (╬ ̄皿 ̄)凸 ╥﹏╥
Imma let this marinate and just read the comments for Theorie and stuff (which is very entertaining and gives me update on what's happening but not too much spoiler), cuz we're gonna get the answers at the end anyway. Just hope this would run a bit longer lol