Keira Clark

She is a U.S. army general who is in charge of relic missions issued by the United States. In the original timeline, she was the King of War and one of the Four Emperors who monopolized all map type relics, caused numerous world wars with the help of the reckless and unpredictable U.S. President Jacob Grey and relics stored in the Pentagon, and kidnapped Irene Holton's sick parents to use as hostages in order to control and corrupt Irene Holton. In the end, she was finally killed by Seo Joo-Heon.

(Source: Wiki)