“After Hyung disappeared, he was erased from everyone’s memory.”

68 years ago, Kim Shibaek crash-landed in the otherworldly realm of ‘Mach Slecht’ and suddenly found himself returning to Korea.

Upon his return, he is reunited with a younger brother, Taewoon, whom he had cherished as a child.

For Shibaek, only 21 years had passed on Earth since his disappearance.

However, during that time, the world was overrun by monsters, and people began awakening supernatural abilities.

Among the most famous of these awakened hunters is Taewoon, an S-rank hunter and the notorious leader of the Seven Guild, known for his bad-tempered and eccentric personality.

“Why does he look so worn out…? My little Woonie used to smell like sunshine when he stood still and like milk when he toddled around. His chubby cheeks were so soft and plump, and he was so small and cute….”

But Taewoon, who is still adorable in Shibaek’s eyes, tells him a shocking truth before Shibaek can even adjust to life on Earth: Taewoon is the only one who remembers Shibaek, even though he was once an Olympic gold medalist.

While searching for a way to return to Mach Slecht, a system window suddenly appears before Shibaek, throwing him into a series of critical quests.

[Say ‘I love you’ to a living being.]

[Oh, and by the way! If you fail or refuse to complete the quest, Earth will be destroyed.]

However, Shibaek hesitates to complete the quest, and the system informs him that only by preventing Earth’s destruction will he discover how to return to Mach Slecht…?