Qiao Ko Fung & Lai Mei Ka is a successful couple working in Tong Kwun. They have a son Qiao Pak Go. Due to misunderstanding, Qiao Ko Fung and Lai Mei Ka live separately. Their son temporarily belongs to Qiao Ko Fung to take care. As several baby-sitter are forced to leave by the naughty boy, Qiao Ko Fung have to recruit a baby-sitter with very high salary, but still nobody dare to take the job.

Qiao Chun Lun, who is the father of Qiao Ko Fung, didn't get his son understand because he fail his marriage. Qiao Chun Lun knows that Qiao Ko Fung separated with Lai Mei Ka. In order to take care of his grandson, he disguises as a lady baby-sitter to get the job. There are many wordy conflicts and fun between the grandfather and grandson. Another headache for him is the sexy lady Wei Lam, who is a colleague of Qiao Ko Fung.

Qiao Pak Go is injured accidentally. Lai Mei Ka rush through comes back from abroad. Her pursuer and business partner Chu Zi Ming makes every effort her forward the accusation for claiming the right for taking care of Pak Go. Qiao Ko Fung resigns from his job because of his argument with his boss. Qiao Chun Lun and Qiao Pak Go try to let Qiao Ko Fung and Lai Mei Ka reconcile, but fail. Qiao Ko Fung shout on Pak Go cause he leaves home by himself. In the assistance of Police, Pak Go is found finally.

Qiao Ko Fung finds a new job and is assigned to work abroad. Lai Mei Ka and Pak Go farewell with him. Before leave, Qiao Ko Fung reads the letter form his father Qiao Chun Lun. He finally reconciles with Lai Mei Ka.