Twelve years ago, the Liang’s Commanding General LIN XIE alongside his only son LIN SHU led his troops to fight the Yu armies. Court official XIA JIANG (Wang Yongquan) conspired with the others to present fabricated evidence to Emperor of Liang (Ding Yongdai) and falsely accused LIN XIE of treason, resulting in the death of seventy thousand soldiers in Meiling. Though LIN SHU is rescued by the master of Langya Hall, LIN CHEN (Jin Dong), he suffered from severe poisoning, which ultimately led to his altered facial features. Renaming himself as MEI CHANGSU (Hu Ge), he took shelter in the Jiang Zuo Alliance, eventually rising to the leader of the pugilist world. Twelves years later, MEI CHANGSU, as a reputed genius, gets recruited by the Crown Prince (Gao Xin) and Prince YU (Victor Huang), instead, he turns to served the unfavored Prince JING (Wang Kai). On the surface, he helps his childhood friend Prince JING become Emperor, yet he is seeking vengeance on the sly, during which he also re-encounters his financee, Princess NIHUANG (Liu Tao), and other familiar yet estranged people and things. Frail as he is, MEI CHANGSU conceals his suffering to inflict ominous turmoil and help the rightful ruler ascend the throne, restoring the honor of those wronged……

十二年前，大元帅林燮携独生爱子林殊率军出征抗击大渝，悬镜司夏江（王永泉饰）勾结朝臣捏造伪证，向大梁皇帝（丁勇岱饰）告密林燮有谋逆之心，令七万赤焰将士枉死梅岭，林殊幸得琅琊阁阁主蔺晨（靳东饰）所救，但因身中奇毒，需忍受削皮挫骨椎心之痛以致容貌大变，化名梅长苏（胡歌饰），投奔天下第一大帮江左盟，并列琅琊公子榜的榜首。十二年后，梅长苏凭麒麟之才入宫成为太子（高鑫饰）与誉王（黄维德饰）延揽的对象，但他却转投默默无闻的靖王（王凯饰）。表面为扶植靖王夺取皇位，暗里展开复仇之路的梅长苏，重遇曾有婚约的霓凰郡主（刘涛饰）、儿时挚友的靖王、以及既熟悉又陌生的人与物，只能竭力隐藏一切屈辱，以病弱之躯掀起连翻血影惊涛，辅佐明君登上皇位，为赤焰忠魂沉冤昭雪……

唐隆年間，李隆基（馬浚偉）聯同姑姑太平公主（陳煒）發動政變，將蠶食法統的韋氏（米雪）就地正法，擁護相王李旦（李龍基）重回大統！看似重歸平靜的太極深宮，實則暗流湧動……朝堂之上，風雲色變，李隆基與太平公主陣營分化，勢成水火！深宮之中，以主理尚宮局的王蓁（胡定欣）為首與眾妃嬪角力，爾虞我詐！有人因高權重位捨棄良心，亦有人為至親至愛放棄一切！龍武軍任三恕（馬國明）與伺機復仇的何離（蕭正楠）、女史元玥（劉心悠）與甘若芊（黃心穎），四人真情本性，為深宮綴上一筆浪漫……深宮禁苑，懸案叢生！抽絲剝繭後，揭露出一個個塵封多年的驚天秘密；！高牆掩映下，上演著一幕幕蕩氣迴腸的愛恨情仇……

During the reign of Emperor Shang of Tang, LI LONGJI (Steven Ma) and his aunt PRINCESS TAIPING (Alice Chan) launch a coup that kills ambitions power-seeking EMPRESS WEI (Michelle Yim), restoring PRINCE OF XIANG, LI DAN (Li Hung Kay) to his throne! Beneath the palace’s tranquil facade lurks an undercurrent of tension…… At the imperial court, the rivalry between LI LONGJI and PRINCESS TAIPING intensifies, like oil and water! Within the palace, the infighting between the head of Imperial Household Bureau, WANG ZHEN (Nancy Wu), and the consorts is running rampant! Some people act against their conscience for power, while others give up everything else for the sake of their loved ones! The genuine characters demonstrated by Longwu Guard REN SANSHU (Kenneth Ma), revenge seeker HE LI (Edwin Siu), Scribes YUAN YUE (Annie Liu) and GAN RUOQIAN (Jacqueline Wong) embellish the palace with a touch of romance…… Deep in the palace, layers of mystery surrounding horrifying secrets are exposed! Beyond the walls, soul-stirring love and hate stories are staged……