The fifth prince of Yaoyang Kingdom had an unknown secret, and he told this secret to his half-brother, the third prince, when he learned to speak. The reason was for no other reason than the third prince's blatant preference for him.
The third prince of Yaoyang Kingdom regarded his half-brother, the fifth prince, as his destiny. After learning the secret that his younger brother told him, his original preference for his younger brother became even more blatant, making everyone who knew them envious.
They were accustomed to their preference for each other and thought it was just a coincidence. But what happened next made them understand that there were so many coincidences and everything was destined.
Concept: Two people whose souls are symbiotic with each other will eventually meet again even if they lose their memories.