The story centers around the Lanyin Biyue, the ultimate sacred treasure of the martial arts world. Possessing it means ruling the entire martial realm.

Lan Qi is a woman determined to obtain the Lanyin Biyue. She possesses peerless beauty and unfathomable martial arts skills. and her pair of emerald green eyes added a touch of eerie, demonic allure. Due to her turbulent upbringing, she disguises herself as a man and is known for her cold and ruthless nature. Thus, she is feared in the martial world as the Green Demon.

Ming Er is Lan Qi’s greatest rival in the battle for the Lanyin Biyue. He possesses profound martial arts skills and a refined, elegant demeanor. He also bears a title that that is evenly matched with The Green Demon, The Banished Immortal. Naturally, an Immortal and a Demon are bound to find each other mutually repulsive.

Ning Lang is the one who was betrothed to Lan Qi as a child. His honesty and kindness surpass even those of Guo Jing, so he and Lan Qi are people from two completely different worlds.

In the struggle for the Lanyin Biyue, Lan Qi and Ming Er, amidst laughter and conversation, secretly plotted against one another with hidden schemes, yet gradually discovered a tacit understanding forming between their hearts. Meanwhile, Ning Lang’s promise “If you’re a man, we’ll become sworn brothers, if a woman, I’ll marry you, if neither, then I’ll remain by your side through life and death” causing Lan Qi’s icy heart to tremble for the first time….

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