The side story starts after 3 years. The MC is finally out of prison. So during those years, apparently he only had s*x with the ML.
So after he went out of prison, he doesn't know what to do anymore. So he was about to go back to his old ways. Sleeping and scamming women, unfortunately, his buddy won't stand up anymore with women.
So he thought of other ways to live off other person, cause apparently, based from the translation, he doesn't want to do hard labor.
He tried to do it with a man (fat and ugly) in a motel, but got up immediately and left.
Then shortly after going out of the motel, he met with the ML who was at work and was released in prison already. Then MC started to blame ML, but doesn't directly say cause he is embarrassed, but said it eventually and MC asked ML to sleep with him one more time but ML refused.
Then MC secretly followed ML to his home and asked ML to take responsibility of him cause he can't get it up for women anymore.
Then both of them did it at ML's home. This and that happened then the end.
Note: The last part of the final chapter of side story actually got me a little bit confused since I only used a translator to read the dialogues.
So I do agree with some that he may be childish. But I did search for some spoilers and I came across some and told that the ML was not a red flag, and few of them mentioned that actually.
This is from an account called beorious.
"I won't lie, there were long hours of reading with a heavy heart because of the manager's and the actor's pitiful childhoods. So, if anyone thinks about giving up on the reading because of the actor's (initially) spoiled personality, I ask from the bottom of my heart that you keep reading and don't hate him."
If you want to know more just search on google, you'll see some more spoilers.
His only red flag is his spoiled personality, I think?
Note: I am quite a curious person so I tend to search for spoilers a lot (if from novel). (▰˘◡˘▰)
The mf brother, he is still alive. So I just looked at the raw chapter 19 and 20. So here is what I have seen. Please take note that I don't really understand korean, so this is just based from what I have seen, and translated some parts. And I didn't read the chapter 11-18 either cause im busy rn.
The MC was taking the healing orb or something then the mf brother came, and stole it from him then captured the MC.
Then they met ML, and bro has used the orb for his eyes (it was badly injured) infront of them and then he aimed (arrow) at the ML as he transforms into a monster, but the MC covered for him, and was shot by the arrow instead.
Then, bro attempted to shoot the ML again and ML caught it, then suddenly, the orb (maybe) rejected the bro and started to worsen his injured eye, then bro got caught, then executed. Then three months after, MC just woke up then both of them talked then happily ever after ♡(> ਊ <)♡
So this manhwa is only upto chapter 20.