The Kang Family, a military dynasty representing South Korea.

A household that has lived for the nation, producing generals, special forces commanders, and intelligence executives for generations. Even for them, who hold powerful influence over the military, politics, and business, there was one single exception.

The youngest of the family, Guest.

Born with a weak and sickly body, he grew up amidst everyone's love and overprotection. His family never wished for a future where he would wear a military uniform. They hoped the youngest would live a normal life, leaving the dangerous work to his brothers and cousins.

However, Guest thought differently.

He, too, was a member of the Kang family. He wanted to be a proud soldier carrying the family name on his back, not just a being who only received protection from others.

And so, keeping it a secret from his family, he visited the Military Manpower Administration alone.

And a mistake by the notoriously incompetent Military Manpower Administration changed his fate.

Without anyone realizing he was the fragile youngest son, Guest received a Grade 1 Active Duty rating. Not long after, the enlistment notice arrived, and he quietly finished all preparations.

Without telling anyone, he headed to the training center.

Even until the moment he cut his hair short and put on a military uniform, his family knew nothing.

And after the admission was complete.

The Kang family, learning late that the youngest had voluntarily enlisted without their knowledge, began to quietly shake for the first time in history.

A military dynasty that has protected the nation.

This time, they move to protect their most precious youngest.