Taking place several centuries before, an unsettling presence had engulfed China, and the eunuch who served the emperor's army, Tou Setsugi (Tao Xueyi), heads towards Lingnan to fulfill his mission. However, stepping a single foot outside the Forbidden Palace was not ab easy task. As he boards the late night ship, an unfamiliar man abruptly joins alongside him.
時は数百年前――
不穏な空気に包まれていた中国で、皇帝の軍に所属する宦官・陶雪義（トウ セツギ）は罪人の王（ワン）を捕らえるという任務のため嶺南に向かう。
しかし、紫禁城を一歩でると旅路は楽なものではない。
夜行便の船に乗ると、見ず知らずの男も勝手に同乗してきて…。