- When Areum was in middle school, she was forced into the group of girls that bullied Eunha in high school. Areum tried her best all the time to sabotage thier next bullying tactic and protect Eunha. Kind of like a double agent. Sometimes, however, she'd be treated like a baby by them and have to prove she wasn't. It never made her feel good and she apologized right away and said she didn't mean it. Eventually, Areum was excluded from the group and treated as an outcast despite being just like them in terms of wealth and beauty. The outcast label disappeared once she reached high school because those girls graduated.

- Jeaki used to be labeled as the school stalker in his senior year of high school. He was outcasted heavily because of this. The reason he was labeled as such was because he always looked for Eunha to see if she was where she was supposed to be (her suicide attempt is what cause this helicoptering). It was never true stalking, however. He just looked for her, kind of like how your friends wait for you outside of a classroom but before class? In truth, Jeaki kind of took a sacrifice for Eunha because gradually, all the bullying that was centered around her became centered around him until graduation finally occurred. Bet your ass Eunha and Jeaki celebrated like it was New Years. Their high school experience wasn't very nice.

- Iseul is immune to the cold. Haneul's soul sharing has some plus sides. Since Haneul died due to the cold, he kind of just absorbes the cold Iseul would be feeling. Iseul could literally go out in the snow with only his boxers on and he's not gonna feel shit. This comes especially in handy when Haneul's trying to direct him on dates and saying "put your jacket around them! It's romantic!" And Iseul can because he won't feel it!

- When Jisu let's her hair down, puts on some headphones, grabs a controller and sits beside Gyeong, his smile gets really wide before he shouts "Gamer mode activated!". It always makes Jisu laugh. Gyeong loves how she looks so relaxed when it happens too. It's like a magic transformation to him.

- Gyeong and Iseul both know how to hack. While Gyeong is self taught with sprinkles from his dads stories, Iseul is taught by his mother. They're both labeled as the hacking gods of RFA. Sometimes, they even have little battles together to see who's better.

- Haneul is the inventor twin. He invents stuff that can help him out. Most of which are dangerous but not all of his inventions are bad. He once offered to make Eunha a robot cat since she loved cats but was allergic. When he was still alive, he made a bunch of inventions but always destroyed them for fear it would hurt Iseul. Now, he's advanced enough to make those inventions but program it to know who it's enemy is. He can also make robot clones of people....

- Most confuse Gyeong and Laon for brothers when they first meet them. Sometimes, they even slip up and call each other 'brother' or 'bro'. They may be cousins but fuck if they aren't brothers.

- If MC, Saeyoung or Saeran can't get to them while they're sick, the Choi cousins are cared for by Jisu since she's usually over there for one reason or another. She's the one that gives them medicine and worries over them and uses her knowledge in caring for the sick with them (of course, her expertise is the basics, patching up injuries from fights thanks to Laon and animals). Laon loves it more because she babies him and he loves being babied. Gyeong gets the same treatment but the fact that she calls Laon 'Yeobo' is why he feels a lot more special. They love sick days.

- Eunha calls Haneul 'Hannie' sometimes. It's a nickname that started out as a joke but kind of stuck.

- Laon and his mother aren't exactly on the best of terms but when they do meet up together, they usually get along even if it's fake sometimes. Laon will call her 'Eomma' on the best of days or with slipping up and his mother will look at him for a while before asking what he said. Laon suddenly turns into a tsundere after that.