The protagonist of this world. He's living his second life. Born as the son of his childhood best friend, Lee Min-seong. Male. 8 years old. A new recruit. Swears a lot. Has a bit of a perverted side. Good at cracking jokes. His mental age is that of a high schooler (though he's bad at spelling and can't count past 100). He calls his father 'Lee Min-seong'. He has a bad relationship with his dad, but they are perfectly in sync.

Lee Mal-ddong's father and childhood best friend. A new recruit. Male. 35 years old. Good at cracking jokes. Swears a lot. Re-enlisted because of a law requiring a guardian if a child goes to the military. He has a bad relationship with his son, but they are perfectly in sync.

Private First Class. Male. 27 years old.

Corporal. Male. 28 years old.