Would You Like to Play Da Capo?

Eight men and women with heavy debts, are trapped in a situation where they cannot survive. The eight people are invited by a mysterious man named Ninomiya, an agent of Mr. X, to play a "lottery game" at a permanently closed hotel. The game involves risking their lives and their money. Who is Mr. X and what is the purpose of the game? (Source: DramaWiki)