It's about a farsighted and intelligent employer aka forth wife
of a rich man played by Sheren Tang and a loyal employee played by
Wayne Lai, and the way they struggled keeping the business from
falling into the wrong hands.
trailer
Synopsis taken from wiki
During the mid 1820s, a natural disaster hit the city of Nantong.
Running out of food supply for the citizens, governor Hong Chi-wing
(Wong Wai Leung) used the city's military food supply to feed the
citizens. A few days after the disaster, an official from Beijing
arrived to the city to check the military supply. Seeing an empty
trailer, the Hong family were sentenced to death. Hong Po-yin
(Sheren Tang) escaped from punishment and became a maid in the
Prince's mansion with the name Hong Po-kei.
Twenty years later, Po-kei meets the rich rice merchant Chiang Kiu
(Elliot Ngok) in Wuxi, whom she was betrothed to before the
disaster, at his manor while the Prince was there for a visit.
Chiang Kiu's wife, Yan Fung-yee (Susan Tse) recognizes her and
reveals her identity to the Prince. Chiang Kiu manages to convince
the Prince to free her, and marries Po-kei as his fourth wife. He
appreciates Po-kei's wisdom and persistence, and decides to entrust
his business to her, telling her to find a suitable successor for
him before he dies.
Hungry for power and eager to keep tradition, Fung-yee finds every
opportunity for her son, the eldest child Chiang Bit-man (Pierre
Ngo) to be the only heir of the family business. She tries to strip
Po-kei from power even when Chiang Kiu's final will reads that
Po-kei should be the full owner of the business.
Despite attacks from the family, Po-kei manages to keep the
business in good shape. She is impressed with second son Chiang
Bit-ching (Ron Ng) and guides him to become the successor, but her
efforts are met with Chai Kau's (Wayne Lai) challenges. Chai Kau
seeks vengeance for being mistreated and wants a pay back from
Bit-Man and the Chiang's family uncle, Pang Hang (Lee
Shing-Cheung). After rounds of battle wits and fights, Po-kei and
Chai Kau develop a deep friendship.
Chai Kau appreciates Po-kei's work ethics and pledges his loyalty
to her. With their excellent cooperation and quick thinking, the
business manages to survive through the locusts disasters and the
Taiping Rebellion. Meanwhile third wife, Lau Fong (Kara Hui) and
Po-kei become good friends and sisters, to the point that Lau Fong
even sacrifices her life to protect Po-kei.
