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At the Threshold of an Era was a Hong Kong epic drama series broadcast by TVB Jade Channel from 11 October to 18 December 1999 and 13 March to 26 May 2000 and was extensively promoted by TVB as its cross millennium, one hundred episode long epic. The series composed of two parts, with a gap in between airing. The entire series took place in a continuing flashback, with the protagonist, Tim Yip (Gallen Lo), pondering the trials and tribulations he went through while riding on a train in the "green city" he developed. In 2022, the drama was selected as one of ten classic TVB dramas being honoured for Youku and TVB's new programme.

The drama documents the rise and fall of three entrepreneurs, who founded Lik Tin Century Corporation (力天世紀) together to achieve the ultimate goal of developing a pollution free town in Hong Kong. Vendetta and love serves as strong subplots throughout the series, with the vendetta between two families being the most prominent. The stories covered a span of 20 years, from 1990 to 2010, and featured many technologies that came to age during this time, including the nascent internet, and a bulkier tamagotchi virtual pet device (shown as a device similar to Game Boy in the series), which was developed by one of the entrepreneurs before his entry into construction.

It was speculated that the show was not originally meant to become a cross millennium event, and was rushed into development and broadcast by TVB because of a slump in ratings. In Hong Kong, TVB is the predominant TV station in terms of ratings, often receiving 90% viewing shares. During the summer of 1999, the Mainland Taiwanese drama My Fair Princess, aired by rival broadcaster ATV, took away a significant portion of TVB's audience, and came out on top in the ratings battle during certain hours. It is speculated, but never confirmed, that the managements of TVB drafted its top actors and actresses to perform in the series, and rushed the production into broadcast as a weapon against the resurgent ATV. Supporters of this theory point to the splitting of the series into two parts, with a gap in between the broadcast to allow for production time. Opponents of the speculation assert that ATV only had a one off hit with My Fair Princess, and there were no other series afterward that could have retained the audience that eventually returned to TVB. The opponents also allude to the fact that even during the lowest point of the entire crisis, TVB still retained a competitive edge in ratings, and would have been able to defeat ATV right after My Fair Princess concluded. However, this still does not provide an explanation to the gap between two series.

The series was the costliest ever produced in Hong Kong television history, totaling more than HK$100 million (US$12.8 Million), thus creating a record that no other television series has ever been able to break until The Gem of Life in 2008.

Tim Yip Wing tim (葉榮添, portrayed by Gallen Lo): The main character in the series, and an ambitious entrepreneur, he is the leader of his circle of three friends that established the Lik Tin Century (力天世紀) construction corporation. Throughout the series, Tim has sometimes resorted to rather unsavory tactics to get things done due to his poor upbringing and his lust for revenge. As the main character of the series, he faces many challenges like the constant betrayals of his best friends (especially Michael), the feud between the two branches of Yip families, and the love obstacles with the many women in the series. He cares most of his family and friends yet at the beginning of the story, he was too bent on revenge, resulting in unethical schemes that hurt others around him. But through the long course of the story, he realizes his mistakes and evolved into an honorable person. Michael Hui Man piu (許文彪, portrayed by Sunny Chan): An urban planner and the most educated person in his family, he was the brain of the gang of three, and the most principled one out of all three in the beginning. However, his world begins to fall apart when his estranged family was placed in danger and little by little, opportunities of corruption keeps coming up that could help him solve most of his problems. After a stressful event, he finally succumbs to the glories of dirty tactics and the crisis turned him into the villain of the first series. His evolution was so big that he would eventually turn on everyone he loved just for fame and fortune. He was probably Tim's greatest friend and greatest challenge. Over the course of the first series, Tim first tries to get him to see the benefits of walking outside the straight line and will later try to make him repent his sins. He eventually dies at the end of the first series after being pushed off a cliff. Ma Chi keung (馬志強, portrayed by Roger Kwok): He is the most unimpressive of the group of three due to his naivete but he is very nice towards his parents and friends. He started off as an investment counsellor and joined Lik Tin after he was fired from the bank. After his parents' death, he left the company when he realizes that their deaths were part of a defamation plot hatched by Michael and Tim. Though sometimes considered the weaker one, he is a good natured innocent boy stuck between Tim and Michael. He is the friendly one who always stops the arguing of the three friends.

David Fok King leung (霍景良, portrayed by Kwok Fung): Chairman of the Fok's Group (霍氏集團), and is known for his extremely unsavory tactics and ever shifting alliance arrangements. Tim Yip worked with him at first to secure Lik Tien's future after a disastrous spell, but later ditches him and battled against him head on. Like Helen, he has a rocky relationship with Tim, often partnering with him when there is profit but his large company makes him a bully of sorts. Liza Fong Kin ping (方健平, portrayed by Liza Wang): Initially wife of David Fok, but later divorced him upon learning that he is cheating on her with her best friend, Sabrina. Eventually married her longtime friend, Howard Yip. She is extremely wise due to her experience in the corporate world and always approach situations in a calm and diplomatic manner. Helen Fok Hei yin (霍希賢, portrayed by Flora Chan): Love interest of Tim Yip, and worked in Lik Tien Century as their legal advisor for that very purpose. She is very emotional in her dealings and that leads to a rollercoaster relationship with Tim. She married Barry in a rebound but eventually realizes that her heart still lies with Tim, especially after a change in his personality.

Hui Tai hon (許大漢, portrayed by Lau Kong): Father of Michael Hui and a former police officer. Like most of his family, he is uneducated and extremely arrogant. Now he spends his days in gambling rings and picking fights with anyone that shows even a hint of disrespect. He was shot by police while chasing Tim with a butcher knife and died. Cheung Yuk fong (張玉芳, portrayed by Rainbow Ching): Estranged mother of Michael, who cheated on Michael's father and left for Taiwan. She has another son, Nick Cheung (張自力), who is a gangster at the time Michael knows of his existence. Hui Man kwan (許文坤, portrayed by Andy Dai): Brother of Michael, and is known for acting before thinking. Like his father, he tends to gamble a lot and plays the stock market in hopes of making a big fortune in a short amount of time. He later joins Michael in his schemes to run Ming Fo, once a subsidiary of Ming Dai and is arrested by the ICAC in his brother's place for budgeting fraud. Hui Man ying (許文瑛, portrayed by Celine Ma); Sister of Michael. The most useless sibling and goes into beauty and makeover business ventures with little to no success. Nick Cheung Chi lik (張自力, portrayed by Louis Koo): Half brother of Michael. Initially fell into a bad crowd due to his poor upbringing in Taiwan, but after a near death experience where Michael saves him, he tries to redeem himself. Eventually, it is his good brother that leads him back into the wrong path once more.

Ivy Shum Wing yan (岑穎欣, portrayed by Kenix Kwok): Love interest of Tim Yip in the first series, she stood by Tim during his hardest hours, and did many things for him with little or no rewards in return. She eventually married Michael and goes into a small business of her own. She has little self esteem and is always wondering if she's good enough for him. She soon realizes that the sincere and innocent man he once was is now a monstrous villain. She was framed for murdering him by Jason Yip and was jailed in Taiwan. After an escape attempt, she is shot by the police and dies. Tina Pang (彭芷蔚, portrayed by Maggie Shiu) An upper middle class woman who strives to be successful in all her endeavours. At first is dating Michael Hui but leaves him due to his non existent ambitions. When he turns a new leaf, she finds herself attracted to him because of his new headstrong and forward looking perspective and is somewhat jealous of Ivy for being with him. She treats Joe like a pet, someone to be used in her business endeavours due to his finances but can never rely on him due to his incompetency and playboy nature. She soon realizes his feelings for her are true and ends up with him only to be kidnapped by Jason along with Joe. Barry Kwan (Portrayed by Michael Fitzgerald Wong): A lawyer who studies in the West, he immediately develops an infatuation for Helen which turns into love. He has poor Cantonese skills due to his upbringing in the west and will often mispronounce words and uses English during court proceedings. Unlike Tim, he is an introvert and apologizes too often usually for things that don't even warrant one. He begins a relationship with Helen and eventually marries her until he realizes her heart lies with Tim. Sandy Ho (何佩琪, portrayed by Florence Kwok) A lawyer who's working in the same firm as Helen, she often provides Helen with romantic advise. It is ironic because she is in a relationship with a married man which often leads to dramatic antics. She develops feelings for Keung at one point but after his parents' death, she cannot handle his constant dependency on her and his reckless nature due to the lost. Tin Ning (田寧, portrayed by Ada Choi) A bar girl that once had a fling with Tim in Taiwan years before the series began however his operational nature and an opportunity for business was always a priority before she was. He eventually leaves her without notifying her. Years later, she is with Nick. Cameo appearances by Kenneth Ma as Stanley, Lik Tin's stock broker and Raymond Lam as a Taiwanese prison guard.

The series was repeated during late night hours in the summer of 2005, and, to the shock of many analysts, drew impressive ratings. It drew twice the audience comparing to 2004's late night hours rerun. Traditionally, reruns only serve as fillers in the late night hours and were never expected to draw impressive ratings. TVB has since undergone a rethink into the philosophy of reruns and is currently broadcasting more high quality shows during rerun hours.