On this land sprinkled with the blood and sweat of the elves, the feather tribe, an angel-like race with wings, ruled the entire Kingdom of Tia with force. As the class conflict continues to intensify, the conflict between the Yu Clan and the Elf Clan continues to intensify. Around the most important and sensitive period of the Yu Clan Saint's replacement, the two sides are at war with each other. A fierce civil war is brewing within the entire Kingdom of Tia. What is the truth behind the wings behind the Yu clan? As the new saint of the Yu clan, where should Ye Yu Nord face her lover, Nas, the captain of the Elf clan's "Northern Return Guerrilla Force"?