- Jeaki and Iseul had met when they were children. It was on a playground when Iseul fell so Jeaki helped him up. Thier friendship continued on until Rika and Isuel moved from the school, where Iseul and Jeaki had went together.

- Iseul is younger than Jeaki by two years. At least on records.

- When Jeaki and Iseul reunited, by the Areum kidnapping, it was very confusing for Jeaki.

- Due to his sister being a victim by Iseul and his personal friendship with the blonde, it caused a love/hate relationship to form between them.

- Jeaki treats Iseul like a child when he wants to be mean.

- They say "I hate you" a lot.

- In reality, they don't actually hate each other as much as they lead themselves to believe. In fact, Iseul will be the one to confront Jeaki if they start being too mean to each other.

- They do fight. If it's physical, they never go for the face or below the belt. Even they have rules.

- If it's a verbal fight, it usually ends up in Iseul crying slightly and Jeaki trying to comfort him, his own lip quivering at the start of tears. Theyre just big babies when it comes to one another.

- Gyeong has commented "lol, it's like the overprotective brother hates his sister's boyfriend trope."

- Iseul hates it when Jeaki puts on a poker face around him. It hides what he's feeling.

- Whenever Jeaki treats him like a child, Iseul always complains that he's not three and proves that to Jeaki in any intellectual way he can.

- Iseul will say "Mr. Han, I really hate you," just to piss Jeaki off. Jeaki does not like being called Mr. Han.

- Iseul wears Jeaki's glasses and doesn't give them back until he's toyed with Jeaki enough.

- Jumin has never said it, but he finds it ironic. When V and him were younger, they imagined thier children would be best friends. Now, one of his kids is V's child's rival and his other one literally dated V's child but broke up (kind of sort of maybe. They still are complicated).

- If Iseul could describe Jeaki's looks in one word, he'd say hot.

- If Jeaki could describe Iseul's looks, he'd say cute. Like a child. Que a frustrated scream from Iseul.

- Iseul was Jeaki's placeholder assistant for a month or two.

- Jeaki adores Iseul's love for all things living.

- When Areum and Iseul are sitting too close, Jeaki will sit on both of thier laps at the same time and say "You are too close, just doing God's work".

- You know how Jisu is a tsndere to Laon, right? Jeaki is a tsndere to Iseul.