Brother Emperor, You Must Pamper Me and Love Me for the Rest of Your Life.

She is his treasure, and he is her heaven. He is the brother and the king, and she is the sister and the princess. "Brother, promise Yi'er. You will love me and spoil me for the rest of your life." "I promise you." "Brother, let's hang ourselves on hooks for a hundred years and we won't be able to change our ways, huh?" A childhood agreement is a life-long commitment.