
What can I say. It's very enjoyable seeing them fall in love in a quite slowburn they're so cute... Good boys... wholesome...
Sometimes a bit embarassing too watch because they are sometimes a bit shameless.... but still so cute...
I would recommend people to read the novel first while still waiting for the comic for the visualization.

I think Ruby is actually living as Sarina, not as Ruby. From my POV it seems like Ruby's life is just like an extension of Sarina's life that got short life.
While it's different for Aqua. Right now he is living as Aqua, not the doctor he used to be. He changed, he got affected, he become a son and a brother. He left his old life, he is not the same person he used to be, regardless of whatever Ruby said about him being the same person. To me he isn't.
But Ruby, at this point, just thought that Ruby and Sarina is the same person. The fact that she can change her attitude so fast towards aqua after she knew that he is the doctor says everything. If she is living as Ruby, as HIS sister, she would be feeling the same uncomfort for kissing her brother, just like how she used to behave around her-used-to-be brother, Aqua (I mean, Aqua has always been overprotective of Ruby, but they, especially Ruby, never clings that much on Aqua before, just like normal brother sister relationship.
Now, in my eyes, she is just treating like Aqua and Ruby doesn't exist. Its just Sarina and her dear beloved doctor. Unlike Aqua that has a full realization that she is his sister, Ruby. Maybe because Aqua lived longer, entered adulthood and society, he is more mature, and is kind from the bottom of his heart, while Ruby is actually quite selfish because she is younger, she never experienced how it is to become an adult.
May be wrong but, I guess that would explain all this incest things she is doing. I'm not liking incest but, I'm thinking this way because I wanted to try to understand why the author made the flow like this. May be wrong tho lol

This is the most objective comment on here. In a way, I do think that the two them being reborn as twins is cruel for Ruby's POV. She's living the life that she wished she could have as Sarina and it's clear with her character that she's not afraid to go for it.
Is it wrong? He'll yeah, but she's never let Aqua's meddling stop her idol career and she's certainly not gonna give a fk if he denies her affections either.

it's true that the group did kinda "ignore" him. Instead of showing affection and understanding they did get scared and even avoiding interactions with him because they know real sihyeon would hate that and he would reject them hard. But Getting rejected is not a nice feeling, y'know... it's also understandable why they avoid him because sihyeon was literally very sensitive and rejecting everyone. Not only that he seems kinda picky for his job too and made a lot of trouble for the group and the manager? (maybe because of his disorder). He is also unstable yet won't say anything. He made a lot of scandal and made the group reputation kinda.... wonky. Probably also because if that one fking guy we still dont know who.
Plus, thinking carefully, If they're still a trainee then yes, its their fault for not paying more attention, but in a way, they're now a fully fledged popular idol that must have been busy. They have jobs and needs professionalism, clear head and reasonable acts, etc etc. They had anniversaries but sihyeon couldn't bother (perhaps bevause of that one fking man that made his mental disorder). I mean, they do gave up on him and thats not nice of them to do. But its still not like they're at fault. They're not actually being toxic to sihyeon, sihyeon is being toxic to them because of his mental disorder. "Ignoring" him seems to be the best way to maintain the group stability. But its not exactly siheyon's fault either. Everything just happen at the wrong timing, wrong condition, wrong way, wrong approach. Sihyeon needs help, yes, but acting this way, its inevitable that the people around him will get irritated by him. Seeking unconditional understanding is very unrealistic especially in real life (this is fiction tho HAHAHAH).
I do understand the comments saying "they should've been the one that has sihyeon's back all the time as they're the one closest to him" tho, but being very patient with people with aggressive mental disorder is not easy. It's not that easy. Although I know this is a fiction and actually the author may choose to make them supportive instead (which the story wont even start then lol), maybeee?? They're trying to be as realistic as possible on their relationship. Because It would take a very nice, dedicated, and patient person to heal him.
And guyssss do remember that all of this happen because of that one fking unknown man and everyone seems to be blaming the wrong guy.

LOL its because everyone start talking about how toxic the group are and kinda hated them for only treating the current sihyeon well, not the real sihyeon.
The thing they forget is, they decided to be good to sihyeon after his death out of regret, thinking that THEIR Sihyeon is in the body. Their act is for real sihyeon cuz what they only know one sihyeon.
They are relieved by the current sihyeon, exactly because he's not agrresive. They can became closer now and they're happy for that because before, whenever thet tried to get close, sihyeon got histeric.
And because the story is from old and current sihyeon's POV, everyone forget that real sihyeon even made the young black haired guy (I forgot his name) sleep in the living room almost everyday because of his disorder and he never complains. Here, I thought, sihyeon is the one being toxic no?
LOL SORRY FOR LONG REPLY

Well I got hooked and decided to read the novel's translation and its so funny LMAO. The manhwa has a really good drawing so it become cute + funny but in the novel its like hillarious + so cute because it focused on what he thinks and his action.
SPOILER REALLY DONT READ IF U DONT WANT
THAT POPCORN ISN'T HIS LMAOOOOOOO IT'S THE GUY SITTING ON YANYAN'S LEFT'S Yanyan js so embarassed and paid compensation for his popcorn (If you noticed the author deliberately showing this guy's detailed face in full color, so I guess he gonna show up next chapter)
MORE ABOUT THIS GUY (CUZ IT'S HILLARIOUS)
He recognized them and eventually occasionally helped yanyan took down antis on the internet on the later chapter because in his head, yanyan, a person who took other's popcorn and added 2 more zero for the compesation fee would not be as malicious and cunning as the antis said (which indicates that he thinks yanyan is stoopid LMAO)

Here u go~ in this link its already on the popcorn scene chapter
https://www.blackbox-tl.com/novels/ismm/ismm-chapter-40/
I can already imagine that if that cute girl is the fl, the mc will be called disgusting again lol. Because mentally he is a lot older and its weird to love a kid or something. People either want them to be asexual or maybe with those far older than them?
Nevertheless I think they'll be so cute togetherrrr, MORE UPDATES PLEASE.