He is one of the powerhouses of the Ninth Step who was present when the demon first appeared on the Holy Demon Continent and he fought against them. Later, he died against the demons, and he was resurrected as an Undead with the help of a Super Forbidden Spell along with 62 others and they were known as the Eternal Heroes.

The Eternal Heroes fought in the Star Domain to bring back humanity's hope to defeat the demons.

Ye Sanmi has a 3-star Star Crown (The Star Observer.). Its ability is to observe, learn, analyze and record everything he sees.