Sophisticated banker CHEUK YAT YUEN (Ray Lui) mistakes con artist SA FU LOI (Gallen Lo) for his half brother CHEUK YAT MING, fortuitously elevating the swindler to one of the leading figures in the banking industry. The lost and found brotherhood has blinded YUEN to FU's real nature and intentions.
YUEN is kidnapped overseas by a group of rioters. He undergoes a dramatic personality change after the incident. YUEN's wife HO TSEUK NIN (Jamie Chik) has tried her best to console him but still cannot help him get over the unpleasant experience. Longing for more comfort and support, YUEN gets back with his ex-lover TUNG LING CHI (Kenix Kwok Ho Ying). NIN is heartbroken to learn about the affair and it has left the broken mirror that can't be mended.
The identity of CHEUK YAT MING gives FU not only a sense of family warmth but also a sweet taste of romance. He finds himself in love with YUEN's little sister CHEUK YAT SUM (Anita Yuen). SUM is attracted to FU too but thinking that they are true biological siblings, she decides to keep her love under wraps and stays with her long-term admirer KO TOK MAN (Joe Ma) instead. This comes as a huge blow to FU. He is not willing to lose his love, but neither can he reveal his real identity. Caught up in the dilemma between love and money, FU finally chooses the fortune road of no return.
It is all about a tough battle for money, a devious triangle of love, and a severe challenge to ethics.
Into Thin Air' begins with Zhing and Winnie as a married couple. One day when Zhing is solving a case about a 'Rose Murderer', his son is there. His son wants to play with Zhing and Zhing is annoyed because he is trying to catch the murderer, so he shouts at him and pushes him away. Zhing then tries to find the murderer but the murderer has escaped. After this incident Zhing was fired and wasn't a police officer anymore.
Two years later the series tells us that Zhing and Winnie are divorced. Zhing has opened a service place that helps people find lost belongings with his cousin Super and friends Bo and Yen. Zhing has opened this servicing place to help people find what they have lost and also in the hope of finding his son.
Siu and her father are in the acting industry but they play small parts in series and they help out the director. One day Siu is looking after many children that are a part of a series and she brings them to a fast food restaurant. The children are all running about and being quite noisy. Zhing and Super are at the fast food restaurant too and see all the children running around in circles. Siu loses her earring and Zhing helps her find it. They acknowledge each other and Siu and Zhing exchange business cards.
'Into Thin Air' continues with a range of sub plots, mysteries and investigations. This series is also full of suspense, romance and emotional moments.