Tae-Ho (called Teo by his associates) is the apparent leader of the Forgotten Tals, "those who observe". His job is to ensure that Yu Jin's succession takes place. He tells Jack that the Forgotten Tals should not exist in this generation, but he is here because of the existence of errors.
Note that "Tae-Ho" is the fan translator's spelling of Teora Hao. The reason why they altered the spelling so much is a mystery.