He is the mysterious soldier under King Li Shimin of Qin. On the eve of the Xuanwu Gate Incident, a vague reminder determines the direction of the empire; he is the old eunuch with deep eyes standing in the shadows when Wu Meiniang enters the palace; he is the storyteller who sighs in the wine shop when Fan Yang rises in Anlu Mountain; he is also the unknown old pawn who carries the young prince out of the secret passage of the palace when Huang Chao conquers Chang'an.
He served every emperor in different capacities - imperial physician, martial artist, eunuch, and hermit. With wisdom and gentle force that transcended thousands of years, he quietly exerted force at key moments in history to support the building from collapse. He has seen the prosperous age of Zhenguan, experienced the glory of Kaiyuan, and tasted the endless loneliness in the flames of the Anshi Rebellion and the whirlpool of the Niu and Li factions.
However, immortality is not a gift, but the cruelest curse. He must carefully hide the secret, but three hundred years will always leave clues. From Yuan Tiangang's back-pushing picture, to Li Bai's poem "The Immortal caressed my head", to the vague portrait of "Mr. Zong" in the secret archives of later emperors... His existence eventually became a vague legend in the history of the Tang Dynasty.
