The hero in the Three Realms War was blessed with two sons, and the high priest predicted that the child would be the "Son of Two Dragons".
"Dragon of Keeping" and "Dragon of Destruction".
"Shou" means "to protect", and he has the power to protect everything.
"Mi" means "destruction", and he has the power to destroy everything.
The two seem to be at odds with each other, but they are also mutually reinforcing.
Everything has a bottom line. As long as that bottom line is not destroyed, everything is "perfect".
If it is destroyed, it will be out of control!