Warning: The series is under the tag "비욘드 하드코어", which means beyond hardcore. Meaning this series is not suitable for everyone and can be potentially triggering.

13 years ago, Baek Yugeon and his brother were the sole survivors of a mysterious anomaly attack, leaving them “awakened.” While his brother obtained supernatural powers, Yugeon became a “guide,” a being who could keep such powers under control through physical touch. When the same anomaly appears again, Yugeon’s brother is left in critical condition with the only one who can save him being Woo Shinje, an S-class awakened and the commander of the hunting order, Erewhon. In exchange, Yugeon must serve as the guide to Shinje’s team, which consists of the withdrawn Joo Taein, the beastly Yoon Chan, and the sadistic Kwon Heesu. Though Shinje seems like the nicest on the team, he might prove to be the most dangerous when he states another condition: Yugeon must follow him into the pit where the very anomaly responsible for all his tragedies awaits...

Original Webtoon

Original Novel:
Ridibooks, Bomtoon, Mr Blue, Bookcube
Google Books: Vol.1, Vol.2, Vol.3, Vol.4, Vol.5

Official Translations:
English, French, German, Thai, T.Chinese, Spanish
Japanese: Beltoon, Lezhin