In a fractured world ruled by secret guilds and masked heroes, Joon Taerim is a quiet high school student by day and an unstoppable secret hero by night. Born as "X-001," the first subject of a horrific experiment conducted by four deranged scientists, Taerim's blurry memories are the only remnants of the three torturous years she spent in the underground facility. Separated by a mysterious fire, she believes her childhood friends and older brothers died in the flames.
Unbeknownst to her, those she thought lost have become elite members of "VALORIS," a top-tier guild sworn to protect humanity—and all of them are searching for her. Kang Juwon, the enigmatic top hero with a mask, holds the code "SM-001" and a heart scarred by loss. He transfers to her school along with four others—Ryu Harin, Ryu Hajoon, Kim Yulseung, and Im Gyeongho—bringing with them laughter, chaos, and dangerous memories.
As the past resurfaces, secrets unravel, and danger closes in, Taerim must confront her trauma, reclaim her forgotten bonds, and unlock the power buried deep within her. But in a world where betrayal is masked as loyalty and the second male lead hides a terrifying truth, nothing is ever as it seems.
Will she remember who she is before it’s too late? Will they uncover the truth behind the fire, the experiments, and each other’s identities?
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