Delve into two chilling Hong Kong family tragedies. The Henry Chau case involved calculated parricide fueled by deep resentment and personality pathology. In stark contrast, the Kan Ka Leung case saw uxoricide and filicide driven by acute psychotic delusion, a young man believing he had a mission to 'save the world'. This episode dissects their fundamentally different psychological drivers, revealing how distinct internal worlds led to similarly horrific outcomes and forcing a re-examination of motivation, mental illness, and societal responses to extreme violence.