Rain : Lyric Coloratura Soprano.
 -daughter of Colonel Kim Pyung and apprentice nurse

   Colonel Kim, Pyung's daughter, Rain grew up in a rich household with dreams of becoming a great painter. During the war, her mother is killed from attacks by US forces. Her father, Colonel Kim, Pyung survives the attack and orders Rain to become a nurse and kill Peter Anderson, an intelligence officer. She ends up with killing herself and not Peter Anderson because she loves him.

Peter Anderson : Tenor
  -intelligence officer in the U.S. 24th Division

   Peter is an intelligence officer in the US 24th Division and a very patriotic young American. He serves as director of Korean War Plan. One day, he is injured in an accident. When he is sent to the emergency room, he meets Rain. He eventually falls in love with her after he listened to Rain's tragic story about her mother and the war.

Michelle Morse : Mezzo Soprano
  -nurse and close friend of Rain

   Michelle Morse is an American nurse and Rain's best friend. She can be careless but always stands by Rain's side when the head burse gives her a hard time.

Jane Miller : Mezzo Soprano
  -head nurse

   Head nurse in the U.S. 24th Division. She is notorious for being picky and strict but has a pure heart. She falls in one-sided love with Peter Anderson. One day, she finds out about Rain and Peter and begins to despise them.

Colonel Kim Pyung : Baritone
  -father of Rain and officer in the People's Army of Chosun

   Colonel Kim, Pyung. He loves his country, North Korea very much as a soldier. He commands his daughter, Rain to poison Peter to murder.

Park Hyuk : Baritone
  -Korean assistant officer and Peter's Friend

   Park Hyuk is a Korean assistant officer. He is very elite but very introverted so he has a tendency to rely on Peter.

General Max : Bass-Baritone

   He is the director in the U.S. 24th Division. He is a soldier but a peace-lover. He tries to give Peter a lesson that it is more important to keep peace than to win wars.

The Sound of Heaven : Coloratura Soprano

   Angel's Voice, Blessing the love between Peter and Rain.

The Sound of Darkness : Bass-Baritone

   Evil's Voice, Cursing the love between Peter and Rain and foreseeing Rain's death.