Eve was once called 'The Little Queen of Nasods' when humans and Nasods peacefully coexisted in Ancient Elrios. For thousands of years, Eve was preserved in her capsule unit to avoid the catastrophic battle between humans and Nasods, until an El fragment flew into it. Eve woke up to find out that she was stranded alone in the present time. She gathered her remaining energy and ancient knowledge to revive King Nasod and the Nasod race. A queen cannot be without a king, and Eve understood that best.

Years pass and King Nasod is on a mission to continue the ancient war with the humans. He and his followers had become corrupted and no longer acknowledge Eve. In the midst of the war, a young red-haired boy and his friends destroy the last of Eve's race and ends King Nasod's reign. Once again, Eve is left stranded and alone in this present time as though her efforts were meaningless. But not all hope is lost! Eve decides to regain the power of El and hopes to revive her race once again. She decides to follow the red-haired boy and his friends to find the El Shards. It was, after all, the first time a boy said he wanted to be her friend. 

(Source: ElWiki)

Elsword: El-e Yeoin is based on the South Korean online game Elsword. It was made to commemorate the 10th anniversary.