Can't remember

BL manhwa similar to Two Souls where ML was taken in by MC's dad to train. MC hated ML because he said that the other took away his dad's attention. They have a deep rivalry but still somewhat got along over the years. Later, ML becomes the leader of some demonic army and they meet again. It's historical, childhhod rivals to lovers, and I specifically remember the part where ML shoves 2 or 3 golden orbs inside MC's body in the extras. Cough.