What Kind of Secret Guard Commander Is Our Life-Saving Talisman?

In the year of the Great Disaster, his parents sold him for his younger brother, and after several changes he entered the secret guard camp. At the age of five, he was trained by him. At the age of seven, he killed for the first time. At the age of nine, he was accompanied by the emperor's legitimate son as a reading companion. He followed him for a full twelve years. After the emperor succeeded to the throne, he also successfully took over his master's secret guard camp after years of hard work. He thought that life would go on like this, and he thought that the emperor was drugged by the maid next to the queen mother. He only knew how to protect the emperor, but he didn't know how to face the emperor's love.