A laboratory filled with nothing but chaos and silence, devoid of any warmth. \[BU-001 Experiment Commencing.\] All Hui-Su wants is death.

*“I don’t want to live anymore...”*

One day, Seung-Hyeon, the ideal guide, appears before Hui-S, a Sentinel who has become so numb from heartless, painful acts and unwanted experiments that he can no longer feel pain or even emotions.

*“So it’s you, my guide.”*

Unlike the other violent guides, Seung-Hyeon treats Hui-Su with care, as if he were a fragile being, and watching him, Hu-Su begins to feel a strange emotion he’s never experienced before...

*“I’ll always be by your side, so rest easy, Yeomyeong.”

"Hui-Su... Not Yeomyeong—Hu-Su. Do Hui-Su.”*

With Seung-Hyeon’s arrival, colors begin to be added one by one to Hui-Su’s life, which had always been like a black-and-white film.

(Source: Ridibooks, translated)