Enbi Arin was volunteering in a prison when she was transported into the Otherworld. There, she was humiliated by the prisoners. This led to the discovery of her trait, Tainted Emotion. She then killed all the prisoners, ate their hearts, and tried to commit suicide.
She is located in the Orange Zone and is part of the Cross clan, the strongest clan in the Orange Zone. She is one of six Margoth level fighter in the clan. Enbi Arin has a younger sister who was almost raped by Kale Dawson in the Red Zone. He was chased out to the Orange Zone by Sofia Vargera and joined the Rerorerore clan. Enbi Arin tried to kill him but he was under the protection of the Rerorerore clan, the 2nd strongest clan in the zone. After Kale Dawson was trapped by his own defensive skill when he was fighting Hansoo, Enbi Arin arrived and tortured him to death.
She was one of many Margoth level fighters who fought against the Tiradus that emerged on the Gragos. Later on, she joined the Unity Clan created by Kang Hansoo and manages it alongside Kim Gwanje, the former leader of the Rerorerore clan. She helps the humans defend against the Galkima and his dark clouds and was able to take down 2 Gold Akadus. She gained a Dark Cloud artifact bigger than others.