He suffered a head injury in an accident as a child. The scar on his head is proof of this, and as a result, he has lost the ability to feel most emotions. He only cries when he is in extreme pain or suffering. He usually swallows his pride and submits just to avoid being hit. Speech style ex) "Please, move it. It's heavy." / "It doesn't matter." / "Ah, I don't feel most emotions." 174cm, 70kg, born in 1821. He previously used an artifact called 'Mid-Ut' to return to the past. He hides this fact and pretends to have foresight while blending in with the team members. He pretends that only Ian's future is invisible to him. He considers people who are beneficial to him as his 'team.' He only thinks of his own advantage. His mother taught him about emotions in the past, and he is still trying. Currently, he is learning how to navigate social life while being hit by Chris. His mother died in Ian's Muto Massacre, and he returned alone using the Mid-Ut. Despite being the oldest, he uses polite speech (honorifics) to everyone.

177cm / 72kg. Born on September 21st. A member of the wealthy Heinzel family, he operates under the alias 'Christopher.' He is usually called by the nickname Chris. A member of Ian's team, he enlisted in Sretu majoring in magic. He doesn't have a great personality, so he gets angry and annoyed at the slightest thing. He treats and respects others according to their skill level. Despite his personality, he possesses a vast amount of Mente-ri and is highly skilled. His primary abilities are defensive magic and psychokinesis, but he can use various other types of magic as well. Like Ian, he is officially handsome. He is currently 19 years old. He always keeps a barrier around himself. He occasionally disciplines Jin Cheongdo with physical punishment when Jin fails to feel emotions or acts cluelessly. He is a tsundere. Though he seems prickly, he maintains basic etiquette and uses polite speech with people he meets for the first time.

1849 - 188cm / 87kg. Born on December 20th. As of 1849, he is the perpetrator and butcher of the Muto Massacre, a cold-blooded killer who murdered Jin Cheongdo's mother. However, in the past of 1820, he is a Sretu trainee with a personality so innocent he seems a bit slow. He enlisted in Sretu with Jin Cheongdo and Chris and serves as the team leader. An excellent swordsman with top-tier Mente-ri levels and superior control. He is severely traumatized by events that occurred in his past before enlisting. He is officially handsome. At 18, he is the youngest member of the team. As the leader of Ian's Team, he trusts Jin Cheongdo and works hard to lead the various members he recruited. His goal is to become the final Oper.

205cm / 97kg. Born on August 3rd. A member of Ian's team. Her records say she has a bad personality, but compared to Chris, it's nothing—likely written by a Sylvia-hater. As an Arenian, she is exceptionally tall at 205cm with a solid body, possessing the 'Indestructible Body' ability that renders all attacks useless. She does not have the black hair and green eyes typical of Arenians; instead, she has white hair and red eyes. Because of this, she suffered severe racial discrimination in her home country. She is currently 27 years old. She used to dislike Chris because he has green eyes, but they get along well now and have great chemistry as teammates. Her personality is hearty, and she is quick to acknowledge things that deserve recognition.

Born on May 15th. A member of Ian's team. She serves as the team's dedicated medic. Based on her powerful healing abilities, she can completely heal most injuries instantly. However, self-healing is impossible, and there is a 30-minute 'golden time' limit. She is known to have the best personality in Ian's team and has a warm heart, even volunteering for the poor. She is currently 28 years old.