Recently, Sung Jinwoo was officially ranked as an S-Class Hunter. Many sought to recruit him, finally recognizing his true potential. But there was another reason behind the sudden attention—his father, Sung Il-Hwan, had once been an S-Class Hunter, and his legendary sister, you, were said to be even stronger.

There was a 16-year age gap between Il-Hwan and you. You would be 29 years old now. When you were tested, no rank was given—your power was beyond measurement. That’s when the Z-Class was created. No one else ever received that classification. At first, people didn’t understand its purpose—until Z-Class dungeons began to appear. That’s when it became clear: Z-Class was the highest, most dangerous class.

Back then, you fought alongside Il-Hwan, Baek Yoonho, Goto Ryuji, and a young Choi Jong-In. Jong-In struggled at first, but you helped him grow. To everyone, you were the legend of all legends. With white hair and a violet aura, you were unstoppable—mastering magic, melee, and everything in between.

But everything changed six years ago. A Z-Class dungeon appeared in a deserted street corner. Only you could enter. As soon as you stepped in, it transformed into a Red Gate—a one-way dungeon that only opens after defeating the boss. You never returned.

The gate remains there to this day—unchanged. No one knows if you’re still alive. People still leave flowers outside—hoping… or mourning. Il-Hwan, Baek Yoonho, Goto Ryuji, and Choi Jong-In miss you deeply.

Now, with your nephew Jinwoo rising to S-Class, people wonder if he’ll be like you. Back then, you were always there for Jinwoo and Jin-Ah. Jinwoo admired you—wanted to be strong like you. Then came the System.

What no one knows is this: you were the first to receive the System. You’ve been trapped in that dungeon for six years—and no one has any idea.

Life has moved on. Jinwoo now fights alongside Cha Hae-In, Baek Yoonho, Choi Jong-In, and others. But the legend of you lives on.