The young KAM YUK is sold to the brothel by her relatives following the deaths of her parents. LUK KWAI, boss of Luk Hing Lung Soy Sauce Plant, takes pity of YUK and redeems her. YUK has since worked as a maid at the LUK household, taking care of KWAI’s motherless son LUK MAN DULL. Impressed by YUK’s meticulous care and assured of her compatible horoscope with DULL, DULL’s grandmother SO FA decides to take YUK as her grandson’s child bride. Despite her special status as the LUKs’ daughter-in-law, YUK is treated with slightly more respect than a lowly servant. DULL’s second eldest sister LUK CHIN, who has reached a marriage age, is eager to become a bride. However, many a time her marriage arrangement was called off because of the incompatible horoscopes between the perspective groom and DULL. CHIN’s hope revives when rich man’s son CHOW KWOK TUNG brings up proposal of marriage to KWAI……

Before he expires, KWAI entrusts YUK with the enormous task of educating DULL. In order to fulfill his dying wish, YUK is determined to hire the best teacher in town to educate DULL. CHENG SIN, supervisor of Luk Hing Lung, asks YUK to attend a meeting at the plant to negotiate a deal with a foreigner. Speaking no foreign language, YUK embarrasses herself in front of the guest. Luckily, MAK SAU SHING, a teacher from the city, saves her from her predicament. SHING is an enthusiastic educator. He offers voluntary lessons to children with a vision to fight illiteracy in China. YUK is impressed by his vast knowledge and invites him to teach DULL. But he declines her offer in view of DULL’s mischievousness and snobbishness. Since KWAI’s death, FA has been pressing YUK to bear DULL an heir in order to bring good luck to the family. YUK pours her sufferings to her maid……

SHING takes YUK’s offer unwillingly so as to earn money to pay KOO’s debts. TUNG is about to get married, but CHIN is not his bride. To cheer her up, YUK takes her to Maiden House to meet her mahjong mates and bosom friends, MODESTY, FELICITY, FAITH and HOPE, four celibate women who live under the same roof. Regarded as an unlucky woman, DULL’s eldest sister LUK FUN is banished from her husband’s family following his death. Returning to stay with the LUKs, she hopes to ease FA’s mind by lying that she has taken home two chests of gold. Meanwhile, YUK worries that she will be banished from the family for failing to produce an heir. In order to punish TUNG for deceiving CHIN into marriage, DULL takes his fast friends FA CHAK SHUI and SAIMUN HING to seek TUNG out in the brothel and chances on TUNG MUI outside the premises. When FA learns that DULL has visited a brothel, she chides YUK for her negligence……

YUK lets go of personal enmity when she finds out that her presumed banishment from the family is all but a misunderstanding. FA tries to force YUK to enter the marital chamber with DULL, but to no avail. FA vows to take DULL a concubine, who will bear the responsibility of producing the LUKs an heir. Unable to let go of old grudges, DULL seeks vengeance on MUI by making her his concubine. MUI protests against it. MUI is locked up in a firewood shed by FA, who guards against her escape. DULL dispatches his men to ambush TUNG, but the attack is intercepted by SHING who appears just in time. At last, YUK opens FUN’s treasure chests but sees only stones inside them. CHIN has no choice but to tell the truth. SHING takes MUI away from the LUK’s residence, but their move is exposed by DULL. The two are taken to the county office awaiting their sentence……

The pressure of marrying DULL has driven MUI to insanity. Panicking over his grave mistake, DULL soon realizes that it is an act pulled off by MUI and schemes to make fun of her. SIN demands that DULL win the Soy Sauce King Competition in order to retain the ownership of his family business. DULL loses no time to prepare for the contest. SHING is subject to DULL’s torture ever since entering the LUK’s family. His mother, LAI LOI, is heavyhearted over her son’s grievances. In raising money for SHING’s redemption, YUK resorts to obtaining a loan from MODESTY, FELICITY, FAITH and HOPE, but the money they manage to raise still falls short of the required sum. An eccentric old man known as UNCLE MEATBALL is the women’s next-door neighbor. In order to retrieve MODESTY’s cat that has sneaked out to MEATBALL’s, YUK enters the house and finds the old man lying unconscious inside the house……