Madame Curie Cho

Madame Curie Cho is the elder sister of Amadeus Cho.

Early Life
Madame Curie Cho or Maddy for short is the daughter of Philip Cho and Helen Cho who both hailed from South Korea. She was born in Tuscon, Arizona were her parents lived due to her fathers job. The Cho's lived a normal and happy life, but Amadeus showed from his very childhood that he was different: he was incredibly smart for such a young boy, and learnt a lot of things by himself, becoming highly cultured and increasing his already remarkable intelligence. When her brother was fifteen years old, the Excello, a soap corporation, announced an online game to reward young geniuses, a quiz show named Brain Fight. Amadeus participated, and he easily won the $5,000 reward, placing first. The person who had organized Brain Fight, in fact, was another genius and former child prodigy, Pythagoras Dupreee]], whose real aim was to search the world for other people whose intellect might rival his own…and to eliminate them as unwanted rivals. By winning his game, Amadeus Cho had been awarded with the title of Mastermind Excello and the position of “7th Smartest Man in the World” (Pythagoras, by his own claim, was the 6th), and that was more than enough a reason to be killed. Dupree had his men attack Amadeus’ house, and in the following explosion, his family was killed.

Underworld
On a trip to Elysian Fields (the Greek version of Heaven), it was revealed that Maddy didn't die in the explosion, and was still alive, taken by the Excello and kept somewhere, needing his help.