He is Cheng Ling who "takes advantage of the power of the world to dominate the world"
He is the 'unrecognizable but imposing' Prince Yu
When they met at the age of eight, he was a shadow to him; when they fought at the age of fourteen, he tolerated everything; when 'he' forgot him, he swore to protect him for the rest of his life; when they looked at each other in silence at the age of twenty, he could not recognize him; after four years of companionship, he betrayed 'him'. A scene from more than ten years ago replayed, and it turned out that it was a mistake ten years ago... Cheng Ling guarded Prince You for ten years but guarded the wrong person...