Kain and Luna were born into the Moon Clan of Sea City, siblings who relied on each other since childhood. During Luna's coronation ceremony as clan leader, a powerful force belonging to the family curse erupted, killing everyone present except Kain. Kain was thus hunted by the Judges and forced to flee Sea City. On his escape, he met the mercenary Kuang Tie and together they journey to the Divine Realm to challenge the gods...

(Source: Tencent, translated)