A time where positivity and compassion for the weak have disappeared. 13 years ago, the life of the whole family was shaken when a mutant came out of the abyss, into the world. An old catastrophe, the most powerful star Almuten. Yoo Geon, who has lost his one and only older brother, is saved by the S-class hunter Woo Shin-je who appeared just in time. "Be the guide of Erehon and obey my commands, endure anything...Follow me to the end". Yoo Geon is in the midst of those who want to ruin him. To confirm the love and hatred that grew between Shin-je and him... "Don't try to run away to death... I, as your guide, won't let you do that."