S1·E26 The Sad Girl's Journey

A young girl's father is murdered and she claims that a philanthropist business owner is the culprit. Interpol turns up a link between him and a drug cartel based out of Hong Kong. However, without any evidence to support the accusation, Winspector can't touch him, and there will be no justice for the murdered father. It's up to Hisako to infiltrate the organization and get the proof before the girl can take matters into her own hands and kills the philanthropist herself.