What if my Mnemonic phrase is leaked or lost?

The Mnemonic phrase is an unencrypted Private key. Anyone who knows your Mnemonic phrases can take away your assets. Therefore, you must transfer assets out right away when you find the Mnemonic phrases is leaked or lost.

The specific steps are:

Create a new identity/wallet --> Write your Mnemonic phrase for the new identity on paper and keep the paper in a secure place --> Transfer assets to the new identity/wallet