iD_ᴇNTITY or Yureka (유레카) is a Korean style manhwa series created by Son Hee-joon in collaboration with Kim Youn-kyung and distributed by Tokyopop in North America.
The series centers on the main character Jang-Gun and his friends along with their virtual reality avatars in the computer game world called "Lost Saga". When Jang-Gun logs on as a different character, he "Creates" an AI with a personality from the hacked disk he found when renewing his appearance for his once a year renewal process. Yureka is a flutter-brained, but advanced, AI with powerful stats and a real-life doppelganger. It is his turn to see just how deep his immersion in the virtual world goes.