The MC is always the shou and sometimes the gong only in appearance (Not action, meaning he really is always the shou!), and there isn't always explicit smut in each arc.

The arcs mainly have tragic endings, but the build up of the whole arc is done seamlessly well and the capture target (ML) doesn't fall in love too easily compared to other novels.

The backstory is unique (albeit a bit dark) and the process in how the MLs fall in love is interesting as they're all different ways. One's quick to fall in love after MC shows his loyalty, the second only falls in love after he finds out that the MC really wasn't lying, and the third falls in love only after the MC is found out to be sincere, the fourth is when the ML finds out what the MC had done in his place, and the final is the real world where the ML is OP and remembers every one of his past life.

Arc 1: Mafia Boss x Pet Lover

Arc 2: Reborn Boyfriend x Boyfriend

Arc 3: Puppet Emperor (Nephew) x King Regent (Uncle)

Arc 4: Maniac Pe*verted Psychopathic Serial Killer x Childhood Friend/ Obsession

Arc 5 (Real World) : Main System's Broken Mental Data x President of A Gaming Company

Arc 1: Mafia Boss x Pet Lover

Arc 2: Reborn Boyfriend x Boyfriend

Arc 3: Puppet Emperor (Nephew) x King Regent (Uncle)

Arc 4: Maniac Pe*verted Psychopathic Serial Killer x Childhood Friend/Obsession

Arc 5: Alpha General x Omega Prince

Arc 6: Mermaid Patriarch x Human Researcher

Arc 7: Humanoid Robot x President of a Company

Arc 1: There was less angst for which I was happy except ML's one-way forcing MC to sleep with him (sort of r*pe). Soon, romance seems to be progressing very well. If not needed to die immediately to leave the world, it would have been good if MC spent a lifetime there and then die.

Arc 2: Too much angst. ML practically bullies MC and then repents. MC dies not forgiving ML. Makes me sick!

Arc 3: It had a pretty good start but a sudden assassination from third party destroyed all the goodness. And then started a legend of angst. I even cried for the first time (had resolved not to cry knowing that this was filled with tragic arcs) in novel when they started to misunderstand each other. Although the ending in which MC forgives ML doesn't make me satisfied, it still relaxed me from all those tragic ends before.

Arc 4: I hate this arc the most. To me it was all crazy - the start as well as the end.

Arc 6: I loved its start and the near-end part and truly disliked the middle one. ML was unable to understand MC's thoughts while ML couldn't bear ML's killing look.

Arc 7: Satisfied me most except the abrupt end. If didn't include MC's conversations with 001 then this novel would have been a tragic gem capable for polishing. But oh, there are some abrupt endings, s*upid to extreme moves and heartless MC (whom I'm unable to figure out). MC hasn't fallen love properly yet the novel ended made my teeth itch!

all of them have tragic endings because after the shou completed all the tasks he leaves the world immediately which means dying in that world, I think there is only one world where he decided to stay for a couple of years because his system begs him to do, so that the ML would not end up too obsessive with him.. That is from what I understand thru MTL lol???

The ML was is love with the original person, the MC didn't even make him fall in love? What was the point of this arc, to torture the MC and ML?

I hate the r*pe victim becomes lover trope. This isn't tagged that though, and I guess the reason why is because the MC.... doesn't care? Like the system gives him pain inhibitors and in the name of his mission he just... lets it happen and seems to be looking forward to it?

suddenly leaving the world via death isn't my favorite QT ending

He's data that escaped from the worlds. Known as 'Zero'. I think he was also one of the boyfriends our s*umbag MC had.

It's rather underwhelming if you think of the ML and MC's journey. I can say it's reasonable with the fact MC never really received true affection in his world, especially from his poor excuse of a mother but still, after all that angst I was disappointed with the lukewarm ending. I'm happy that the ML stuck with the MC in the real world, albeit not understanding human emotions much since he's DATA he still tried to understand it and even show that he loves and won't abandon the MC. MC's family, especially his mother were disappointing too. The real world arc is TOO short. It did not thoroughly explain what the MC suffered to the point he became like what he is, though it was expressed and compressed in the real world a bit that you would know why. MC, himself, doesn't understand what love really is and how to deal with feelings so I guess they're a perfect match? Also, I hoped there were extras/side stories that shows the MC and ML's life after they got together considering how short the real world arc is but we can only make do with this.

unexplained past

didnt even give ML a name just a code name 'ZERO', as for why he bacame broken mental data and if he can resist the main system why he didnt show up earlier, the author didnt explain.