After DOR-LOK is implicated in the alleged counterfeit money ring, PIT-TAT suspects that it's the deeds done by their former tenant DAI MAN-MO, whose tenancy was terminated by their company early because he had been late paying the rent. OI-WAH is convinced that PIK-KEI's appearance has inevitably added pressure to PIT-TAT's family relationships, suggesting that she should go to Singapore for further training. As for KIN-CHING, she runs into YIU-MING and SUET-MUI who has a wrist injury. Seeing that her daughter KIN-CHING gets along very well with YIU-MING, SUET-MUI cannot help but feel there is more to their relationship than it appears. Having returned to the unit together with DOR-LOK, PIT-TAT notices there is something wrong with the air condition, in which he even discovers a small bag with a diamond hidden inside. At that moment, MAN-MO suddenly appears and simultaneously leaps forward to grab the diamond……