This is a story about the struggle between imperial princes for the throne. When they were young, the three brothers were close companions who talked about everything and were inseparable; the brothers were deeply attached. As they grew up, for the sake of the throne, various schemes and plots arose among the brothers, step by step leading them into the abyss. The crown prince had received all kinds of favor from the imperial father since childhood; the second prince guarded the borders year-round, holding heavy military power; the third prince appeared gentle and refined on the surface, but had a deeply calculating inner mind, framing the eldest and second brothers in various ways, and ultimately reaping the fisherman's profit to ascend the imperial throne step by step.