The Other Side of the Horizon

The Other Side of the Horizon is a 1984 Hong Kong "wuxia" television series starring Andy Lau, Lawrence Ng and Angie Chiu. Produced by TVB with Raymond Lee serving as producer, the series ran on its channel Jade from 3 to 28 September 1984.
Plot.
During the Yongle period of the Ming Dynasty, a "Demon Region" appeared in the martial world. The "Demon Region" left a trail of destruction and gave hardships for the livelihood of people.
In order to eliminate the "Demon Region", the Wudang Sect dispatches a group of elite disciples to attack. The disciples fail to do so and Mo Chan-chi (Chu Tit-wo), head of the Sect, pushes the blame to disciples Fu Ching-wan (Andy Lau) and Mo-yung Pak (Lawrence Ng). Because of this, the entire martial world is hunting after Fu and Mo-yung, and the two of them eventually take refuge to the "Demon".
Fu and Mo-yung, however, were surprised to discover that the "Demon Region" is not an actual demon region, but is in fact, is an utopian society. It also turns out that Fu and Mo-yung were actually sent undercover by the Wudang Sect to investigate the "Demon Region". Under the sabotage of Mo-yun, the citizens of the "Demon Region" turn against each other and massacre one another. Fu, on the other hand, was deceived by Mo, which led Fu Chin-san (Shih Kien), leader of "Demon Region", to consume poisoned wine. "Demon Region" was ultimately destroyed by the many sects of the martial world.
However, unexpected to Fu, who is in deep regret, Fu Chin-san turns out to be his biological father. When he was about to confront Mo Chan-chi about this matter, he accidentally kills Mo, who at the time was battling with Mo-yung. Because of this, Fu, who was named the "Young Warrior of Wudang", is now known as the "Son of the Demon Region". Mo-yung is then appointed as the successor to the head of Wudang where he kills Fu Chin-san, who has lost his martial arts ability due to consuming poison. Originally like brothers, Fu and Mo-yung have now become sworn enemies, leading the martial world into a bloody storm.