The Immortal Lord Gu Yan is responsible for guarding the "Border of Immortals and Demons", but he meets the Demon Saint Su Xiao - she is forced to come to the border to "break the seal" (the Demons threaten her as a member of her tribe). Gu Yan discovered that Su Xiao was kind-hearted and let her go, but was held accountable by the Immortal Sect. In order to save her people, Su Xiao had to continue to destroy the seal, and Gu Yan chose to help her - the two of them found "the secret method of the demon leader to control the people", lifted the control, and persuaded the two worlds of immortals and demons to temporarily truce. In the end, Gu Yan gave up his position as Immortal Lord and worked with Su Xiao to promote the reconciliation between immortals and demons.
