樂也融融的余宅一家四口，父親余春(夏春秋飾)、母親Selina（李香琴飾）、長女余珠（吳君如飾）及幼男余寶（鄭中基飾），四人是家人亦是好朋友。余寶一向愛情至上，但因「長女未嫁，弟妹不能嫁娶，否則多災多難」的家規，所以情路上一直不能開花結果，而偏偏余珠卻是推祟「單身」及「女人不一定要結婚」的寫作界女強人，身兼總編輯及作家。為此，余寶聘請專門解決愛情大小問題的愛情治療師曹廸克(古天樂飾)，暗裡進入余珠的出版社工作，以其專業知識及技巧，希望令余珠的一顆枯萎已久的芳心再次茂盛起來。因為曹廸克的出現，余珠在72小時內由兇惡無比變成嘴角含春，對曹廸克暗生情愫。

It has been 16 years since the classic Lunar New Year film - All's Well End's Well was released in 1992 starred with Stephen Chow, Maggie Cheung and Leslie Cheung. Now here comes the 2009 version of the hilarious family comedy. With the brand new story, the film was joined by the film's executive producer Clifton Ko, director Vincent Kok and cast members Sandra Ng, Raymond Wong, Louis Koo, Ronald Cheng and more stars. Yu Bo seeks help from the famous Cassanova, Dick (Louis Koo), to pretend to court his eldest sister and lure her into the mood of love. With Yu Chu falling in love with Dick and wants to introduce him to her parents, he in turn falls in love with another girl, Mandy and Yu Chu is extremely jealous. In order not to disappoint her parents, Yu Chu asks a private detective L (Raymond Wong) to pretend as her boyfriend.

Will Yu Chu and Yu Bo Succeed in finding their true love? Will Dick wins Mandy's heart? Will all's well end's Well?