Areum:

Y'all already know. Both Iseul and Haneul are in love with her. Although, their versions of how to treat love differ greatly. At first, Haneul had no affection for her... Well, as much as he could considering he shares emotions with Iseul. Still, he falls in love with her. He is continuously in love with her even after Iseul gains (almost) permanent control.

Jeaki:

Iseul knows that Jeaki is an ally. In fact, when they were young, they knew each other quite well from elementary school. Though, Jeaki still has some trust issues, he knows Iseul is an ally and not an enemy as seen by their continuous 'coffee dates'. Now, Haneul. Haneul loathes Jeaki so much. Nothing personal, it's just because he's Areum's brother and seen as an obstacle he has to get past.

Eunha:

Haneul knew Eunha while she was in high school. You see, what was happening was that Haneul knew that there was some sort of connection with Eunha. He didn't know what since resets don't exactly help him with memory so, when he saw that Eunha was having some thoughts of suicide, he went into her dreams like a good little guardian angel. Haneul and Eunha are very good friends even if betrayal occurred while Eunha was in the process of saving Areum with Jeaki by saying his real name as she was left behind. Haneul got her back, he wouldn't let that slide. Iseul, however, did not know her so his relationship with her would've been like it is with everyone if only a little devil in his mind wasn't attracted to her. Yes, Shipper6145 , Iseul's small crush on Eunha is because of Haneul.

Jisu:

Iseul absolutely adores Jisu. Jisu and him may not have a lot in common but the fact that he can talk to her so easily and be able to express himself freely is what draws his attention. She's the closest friend he has in the RFA. Areum is something other than a friend. Now Haneul, he doesn't hold anything for Jisu at all. However, since they share the same emotions, Haneul cares at least a bit.

Laon:

Iseul and Haneul really like Laon. Would call him their best friend and you can bet your ass they'd both choose this Choi cousin to help in a prank battle. Gyeong says no fair because "He's the newest ally! You're corrupting him!"

Gyeong:

Iseul has no straightforward opinion on Gyeong but he loves him too. Iseul likes joining on missions sometimes and going out on the town with him. Haneul.... He sees him as an immediate threat, what with him getting with Areum after Iseul forcibly broke things off. Haneul really does see Areum as his still.

This may get updated if things get changed. You have been warned. This is just to answer any confusion as of now in the story.