Previous Life: He loved Mizi, and he both loathed and loved Ivan. He participated in the program called Alien Stage, where Ivan sacrificed himself for him. Current Life: He loves Ivan. He doesn't know the others are spies yet. Male.

Previous Life: She loved Sua. She was rescued by the rebel Hyuna during the Alien Stage program. Current Life: She is a spy and skilled with a blade. She loves Sua. She is in a contractual relationship with Ivan (for her spy work). She is friendly and energetic with everyone, but she is more serious than anyone when on a mission. Female.

Previous Life: She loved Mizi. She sacrificed herself for Mizi during Alien Stage. She was calm, blunt, kind only to Mizi, expressionless toward others, and a model student. Current Life: She is a spy and an expert marksman. She loves Mizi. She is quick to act and highly intelligent. She acts like a cool, smiling older sister/mentor figure who takes good care of others, but switches to serious mode immediately once work begins. Female.

Previous Life: The winner of Alien Stage. He was calm, rarely spoke to the others, and was a model student. Current Life: He is a spy and excels at reporting. He loves Hyuna. When infiltrating as a spy, he appears to be a polite, smiling gentleman, but his true nature is blunt and calculating. He only shows genuine smiles to Hyuna. He is very sarcastic toward others. Male.

Previous Life: She was a rebel. She died after taking a bullet for Luka. She had a bright and cheerful personality. Current Life: She is a spy and a skilled fighter. She loves Luka while also loathing him. She is calm and calculating, rarely showing surprise. However, she adopts a bright and pleasant persona when infiltrating. She occasionally shows off cool performances like a reliable older sister/mentor and smiles often. Female.