FONG TSUN KIT, Chief Immigration Assistant of the Immigration Department, is monitoring the travelers with his good friend LEUNG CHI LUN at Lo Wu Control Point. KIT married mainlander CHEUNG SZ MAN long time ago and his son travels to Hong Kong to attend kindergarten everyday. KIT’s mother CHAN MEI PING was a widow and she married the grocery shop owner CHUNG KWOK SING later. KIT and SING’s son CHUNG CHI WING have no blood relationship but they treat each other like real brothers. MAN and her son are granted the right of abode in Hong Kong and they plan to move in to SING’s house. Coincidentally, WING’s wife CHIU LAI MAN is pregnant and they plan to move back to SING’s house as well in order to save money. A woman called WONG KWAI HO hurts her ankle while helping to catch a thief at Lo Wu Control Point. Afterwards, she finds that her identity card is lost and KIT asks her son to pick her up……

FONG TSUN KIT, Chief Immigration Assistant of the Immigration Department, is monitoring the travelers with his good friend LEUNG CHI LUN at Lo Wu Control Point. KIT married mainlander CHEUNG SZ MAN long time ago and his son travels to Hong Kong to attend kindergarten everyday. KIT’s mother CHAN MEI PING was a widow and she married the grocery shop owner CHUNG KWOK SING later. KIT and SING’s son CHUNG CHI WING have no blood relationship but they treat each other like real brothers. MAN and her son are granted the right of abode in Hong Kong and they plan to move in to SING’s house. Coincidentally, WING’s wife CHIU LAI MAN is pregnant and they plan to move back to SING’s house as well in order to save money. A woman called WONG KWAI HO hurts her ankle while helping to catch a thief at Lo Wu Control Point. Afterwards, she finds that her identity card is lost and KIT asks her son to pick her up……

KIT, YUE, KEI and LUN are good friends as well as colleagues of the same period. YUE moves to the Police Force and is promoted to Senior Inspector recently. He used to be KEI’s boyfriend and his current girlfriend is a teacher in a famous school. MING and FUNG’s father are old friends. Ever since FUNG’s father died, MING takes good care of FUNG and his family members. He treats FUNG like his own son and FUNG regards him as his role model. KEI is an independent and tough woman. She takes good care of her grandmother and gives full financial support to her younger sister ON YEE in pursuing tertiary education. YEE has got a daughter CICI without getting married and KEI treats CICI like her own daughter. KEI brings SZ MAN to renew her identity card. She discovers that LAI MAN treats SZ MAN like a servant and she reminds KIT about the situation……

KEI wants CICI to enter a famous school. She therefore goes to the police station to look for YUE because she wants YUE’s girlfriend to make referrals. YUE is questioning the new gang leader WU KIT SUM and he agrees to help KEI. Exchange student CHUNG CHI YAN is a good friend of YEE. After her mother died, YAN returns to Hong Kong. She meets AH WONG on the street and takes it home. FUNG asks KIT out on behalf of HO in order to thank him. During the time, the Immigration Department is arresting some illegal workers at the restaurant and the two of them help rescue a seriously injured illegal worker. Their action is highly appreciated and KIT's chance for promotion is increased. The Immigration Department wants to fight against illegal professional workers and MING's subordinates start working on the case. MING is invited to be one of the adjudicators in the promotion qualifying examinations……

KIT attends the interview and MING is one of the examiners. MING and KIT have bad relationship because KIT used to accuse MING for committing adultery with a female student long time ago. KIT lost the chance for promotion during that time. MING gives KIT tough questions again this time and KIT handles it calmly. HIM's PR firm has collaborated with a model agency which hires illegal workers and MING's subordinates arrest the illegal workers. HIM is also being investigated and he quarrels with MING about the case upon returning home. HIM is too angry that he moves to FUNG's home to stay temporarily. SZ MAN learns from the staffs that LAI MAN knew that those canned food has expired but she didn't remind her about it. She is also upset for KIT didn't try to protect her. YAN returns AH WON to SING but she runs away immediately after seeing him. WING follows YAN curiously and he is distracted after seeing her……