Open the Door (Imjjadal)

Open the Door (Imjjadal) summary:

“I’ve clearly told you—I’m just an ordinary B0-class guide.” With a top-tier dual bloodline ability, Lee Yeoni lives and works in the countryside, keeping his looks and skills a secret. However, due to certain circumstances, he’s reassigned to the capital and becomes entangled with Tae Hajin, an S+ level esper. This sets off an unspoken power struggle between them.
Tae Hajin, who is suspicious of Lee Yeoni, senses he’s concealing something and is intent on uncovering the truth. Lee Yeoni tries to thwart Tae Hajin’s efforts to expose him, but it proves challenging. To protect himself, he decides to use Tae Hajin as a shield and takes on the role of his personal guide.