A “doppelgangers” website has facilitated the connection between two complete strangers that look like identical twins. Law firm partner Ko Sau-shing tracks down his former lover Yu Fung, whom he has not contacted for ages, online, and Yu Fung is looking for a part-time boyfriend with a similar appearance to him. Sau-shing arbitrarily approaches applicant Mo Kei-nam, who is a dead ringer for him. The duo also covertly agree to swap identities for two weeks. Sau-shing plays the role of Yu Fung’s “substitute lover”, and deadbeat Kei-nam disguises himself as Sau-shing while simultaneously dealing with his wife Lee Chi-ying and father-in-law Lee Kwun-hang as each and every crisis at the law firm is handled by him. While the identity swapping deadline looms, this pair of lookalikes are eventually shocked to realize their mutual life trajectories are already different from their expectations.
The show follows three main characters who team up to solve unusual cases. Although they have different backgrounds, they work together seamlessly to crack the cases. Most of the cases they solve are related to organized crime in the city. Despite the fact that they are not police officers, they are often drawn into dangerous situations, leading them into precarious circumstances.
Renowned restaurant owner Zhang Guan has an affair with dancer Zhu Fenghuang. His brother Zhang Yi replaces him as Zhu's lover. Their fake relationship becomes real, causing a rift. Meanwhile, Zhang Guan's son and brother compete for Mei Jingjing's love. Zhang Jiashu schemes to remove Zhang Yi and Zhang Jiale from the family restaurant. They open their own eatery, which thrives. Eventually, they reconcile and save "Guanyue Village," finding redemption as the "Ah Er" family.
In some faraway place, the Laws and the Chuks are two big families that have been foes for a century as they can never stand each other. In a chance encounter, the Law Family’s fourth son Law Mak-au falls head over heels in love with Chu Lai-yip, who is the younger cousin sister of the Chuk Family’s matriarch Chuk Ying-kiu. Lai-yip already has a finacé. If her marriage eventually falls through, Ying-kiu’s status as the chair will be affected. However, due to some past event about herself, Ying-kiu resolutely decides to let Lai-yip make her own choice, sowing the seeds of a duel between the two families. In the meantime, Leung Shan-pak adopts Max Ton as his name and lives in Hoi Pak City, which is the Law Family’s territory. To avoid assassins, he goes to the Chuk Family’s Tin Nam City and then the mysterious Zone 8. He again runs into two women who were seemingly associated with him.
Irresponsible Ning Rizhao relies on his brother Rilang. Neighbor Yang Xiaokui loves Rizhao. Rilang and friend Weng Yuxiu like colleague Gu Lingdi. Rilang sacrifices his feelings for Yuxiu. Lingdi sympathizes with Rilang. Rizhao reunites with former love Ruan Qiao. Ivory ban causes Rizhao to lose everything. Ruan Qiao suggests work abroad, straining their relationship. Rilang discovers he's not the biological son. Lingdi's father deceived Rizhao. Lingdi tries to accept Yuxiu. Rilang returns when father falls ill. Rizhao and Ruan Qiao reconcile. Lingdi refuses marriage proposal. Lingdi starts a new life abroad.
Disaster is looming in gangland because of a murder case. Cheung Sai-lun, Chinese American drama fanatic, returns to Hong Kong to look for opportunities in showbiz. Sai-lun somehow encounters a policewoman called Koo Yan-yee, who gives him an important assignment that requires him to pretend to be an orphan of Big Boss of Union Gang. With the assistance of a seasoned decoy called Ko Bun, Sai-lun becomes Big Boss. Sai-lun then repeatedly offers help to gang leader So Tsz-shan and an actress by the name of Chong Ming-lai. You Ching-shui, lady boss of some nightlife venue, and a trio of unrelated fresh-faced ladies also keep clinging to Sai-lun. While Sai-lun is starting to venture into gangland, he and Ko Bun become amicable partners. And with absolute protection provided by formidable fighter Luk Chau, crises are overcome. But nobody is aware of some shocking scheme has been awaiting him behind the gang activities.
The complete story of The Legend Of Master Chai in Cantonese TV is about a slap in the sky. Jigong and the roaring dog are fighting from the heavens to the mortal world. The gods and animals are in a big position, and they are in a mess. How to save them?