Vital statistics
Age Unknown
Debut Chapter 8
Occupation Illegal hacker
Online assassin
In-Game Job Swordsman
Family Father (Deceased)
Mother (Deceased)
Weapon Daggers
The creator of the original Yureka. She initially sought Elca out in order to become her partner as a killer for the sake of avenging her parents, who committed suicide after being pushed into a corner.

She becomes obsessed with Jang-Gun, admiring him after watching his adventures through Yureka secretly. Over time, she even came to fall in love with him, but became heart-broken thinking he preferred her doppleganger over her. Even after learning he loved them both, but couldn't choose, she called him a coward and cut off contact, wanting to live in the fantasy that she is actually Yureka and Jang-Gun's beloved.

Jae-ha is a skilled hacker and used her abilities to create an advanced program capable of creating AIs based on people. Her program was responsible for the creation of Yureka and Neogia and the recent addition of the Lotto A.I. based on Jang-Gun. This technology is highly sought-after by corporations such as Dexon.

She is currently comatose after an attack with Elca, by sacrificing herself to save Lotto.


Despite her confident attitude, Jaeha is emotionally unstable, due to witnessing her father murdering her mother and committing suicide afterward. She was initially interested in Lotto after secretly watching his adventures through Yureka to the point of obsession, but gradually fell in love with him. She eventually retreated into her mind, deluding herself into believing she is Yureka, when Lotto rejected her and only came out when Lotto called her name out.



Jaeha originally lost her parents when they committed dual suicide, and she vowed to take revenge. She became a hunter with the intention of switching to a killer. When she encountered Elca she joined forces to learn the ways of killing, though she never had killed anyone before or as of yet.


Hunting at Terror Tower Edit

Jae-Ha is first seen in the multiscanner room, naked in the Cyber Cafe, as Jang-Gun opens the door. He closes the door, but doesn't pay attention, knocking himself backwards from the surprise. She then gets dressed, accidentally dropping the Yureka ID card, and goes to Woon-Ha to get her card renewed. She looks over to see Jang-Gun avoiding looking at her directly, nervously, she simply smiles at him. She then leaves, thanking Woon-Ha.

Meeting Basara Edit

While Jang-Gun investigates about the Jae-Ha, Woon-Ha mentions that she requested copies made of her card in case she loses one.


When Jaeha takes control of Yureka, the skills exhibited are far beyond any normal player.

  • Security Field: Prevents players from logging off
  • Switch: Capable of swapping places with any other player
  • Prediction: Allows her to predict the moves of her opponent and counter them.
  • Maxed Stats: All of her stats are at the maximum level.

Gallery Edit


Jae-Ha holding ID card. Chapter 8 cover.

Community content is available under CC-BY-SA unless otherwise noted.