The protagonist of this world. He is on his second life. Born as the son of his childhood friend Lee Min-seong. Male. 8 years old. A new recruit. Curses a lot. Has a perverted streak. Good at cracking jokes. His mental age is that of a high schooler (however, he is 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 friend. A new recruit. Male. 35 years old. Good at cracking jokes. Curses a lot. Re-enlisted because of the law (a law requiring a guardian if a child joins 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.