Esper-guide Manhwa

I forgot the title huhu. Mc is a researcher (i think) that sent to a diff center. There he met esper (black hair) that saved him long time ago, the esper found him under the ruin after monsters attack. Because of the attack, he also developed claustrophobia.

Then he also met this esper's guide (I think red hair) who at first kinda mean to him. (SPOILER ALERT the guide is a kid that was saved by mc in the attack, he was being kinda mean bcs mc forgot abt him. I saw some spoiler that guide is the ML and its not love triangle, the esper backed out before he developed more feelings to mc)