| War does not interfere with friendship |

Lee Minho and Lee Felix:

Brothers who stick together after their parents died in the war. Minho is serious and strict, he is 24 years old. Felix is ​​very childish and trusting, he is 17 years old. It is because of his brother's childishness that Minho always keeps him close to him.

Han Jisung and Bang Chan:

The boys are very close friends, and before the war they dreamed of becoming producers. But the war ruined all their plans, which is why they both went to the front, but returned with serious injuries. Bang Chan is already 25 and he walks with crutches, because his ankle was torn off. Jisung is only 20 and he does not have a right hand.

Kim Seungmin and Yang Jongin:

Jongin lost his parents early, but became very strict with everyone, including Felix. He is only 16 years old, but he behaves like a sensible adult. Seungmin has been Jongin's half-brother since childhood and looked after him, because he was the eldest. He was also very strict, but never scolded Felix for his childishness. He is almost 19 years old.

Hwang Yeji:

She is from America. Her mother was Korean and her father was American. She has an older brother, but she did not tell anyone about him, because he fought for the enemy army and she was afraid of how her friends would react. She is almost 22 years old.

Seo Changbin:

He is a simple guy who did not go to the front because of poor eyesight and hearing problems. But at the same time he is a very pleasant conversationalist and a good friend. He is almost 20 years old.