Plot: Although CHEUNG-SING and CHUEN-KUNG both suspect that NAM-TIN might be the mole, CHEUNG-SING, in order to be fair, suggests that they should disprove that NAM-TIN is not the mole. With TAI-LIK recalling Uncle YING's behavior before his death, YEUNG MAU spots a name called HUEN in the daily account book during her analysis