Young Master Han Yi has remained in the martial world for decades, investigating an incident from eighteen years ago.
Su Xigu, the 111th-generation disciple of the Yaoshan Sect, fears for her master's safety. She and her disciple Lin Yi descend the mountain to search for Han Yi!
Against her master's wishes, Su Xigu disguises herself as a woman and goes alone to the Palace of Heartbreak, only to be infected with the Western Demon Clan's Holy Envoy's King of All Poisonous Insects, the Green Worm Mother Gu.
But Su Xigu's heart is already moved. After taking the medicine for a month and a half, she falls into an unending sleep!
Suddenly, Su Xigu awakens.
Yet she has forgotten everything from her past and can vaguely remember only her master, Han Yi!
Whenever she tries to remember whether she knows Han Yi, her heart aches!
Will they remain true to their original feelings, or betray them?
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