Plot: TAK-KEI sneaks into KA-KA's bedroom and discovers the badge that belonged to ISAAC in her closet, so he suspects that KA-KA's ex-boyfriend should be the same one as CHOW CHING's. MAK SEI and OI-KIU send the counterfeit baby formula for lab tests, and OI-KIU is very worried, knowing that SHUM WING fell victim to a scam