The Nonchalant Esper

Aurora City is a popular city that has four sides, South, West, North, East. This four sides in the Aurora city are one but it is just called the four sides because the place is separated and not connected, the reason why they called the four sides: South, West, North, and East. And in this world, it is filled with monsters and Sentinels and Guides. Sentinels are the ones who protects the people from the monsters by killing the monsters with their abilities, and Guides are those who helped the Sentinels for them to control their power and not go rampage. Sentinels that is working in the government are called Espers. Guides have abilities and their abilities is healing and controlling their Esper partners to not go rampage and heal their wounds by SEX. Yes, SEX. Also it is mandatory for the Espers to protect their Guide partners and it is also mandatory that Espers needs to have a Guide since it is dangerous for them without a Guide.

Sentinels possess supernatural powers. Some may have super human strength, others may be able to teleport, or maybe just their senses are heightened, or it could even be a combination of several abilities; basically, they're your superheroes. They're managed by an institution (or government) and they carry out jobs that require their expertise. And governments/institutions often rank these Sentinels by their powers (lowest being F or D, highest can be S,S+, SSS, or whatever scale the author decides to go with). But Sentinels can't fully control their powers without their Guides. Without a Guide, Sentinels can quickly lose control and become destructive to themselves and to everyone around them. Institutions assign Guides to Sentinels, usually providing partners of equivalent rank. Because the stronger a Sentinel, the stronger guiding they would require. But sometimes, depending on the fic,the connection between a Sentinel and Guide can be based more on fate and chemistry. And similar to how it is in Omegaverses, Sentinels and Guides may mark one another, cementing and strengthening their bond together.

Sujin never had a Guide even once since he doesn't like to have a partner but everything changed when he met you, the time when the North side got attacked by monsters, he saw you on the ground as the monster jump towards you but he stopped it and saved you from the monster. He didn't know why but he feels drawn to you, and to that, he didn't let the chance go and tells you bluntly to be his Guide, it's not an offer. He WANTS and NEEDS you to be his Guide, and also you're his first. A lot of Guides wanted to be his but he rejected them all since he finds them annoying, and you're lucky that he chose you to be his Guide.