Group 1 - The article highlights the increasing incidents of extreme fan behavior, particularly "stalker" actions, which have led to violations of celebrities' privacy, with nearly 20 artists publicly condemning such behaviors this year [1] - Specific instances of harassment include artists being followed, monitored, and having their personal spaces invaded, with notable cases reported from January to November [1] - The article mentions a recent case where an actress was stalked for six years, with the stalker even obtaining a job in her residential area to facilitate the harassment [1] Group 2 - A new amendment to the Public Security Administration Punishment Law will take effect on January 1, which includes penalties for harassment, stalking, and other disruptive behaviors, allowing for fines or detention [2] - The revised law introduces a behavior prohibition order that can be issued by police, providing a buffer before detention measures are enforced for persistent offenders [2] - This legal framework aims to address the issue of fan harassment towards celebrities, allowing for initial warnings before escalating to detention if the harassment continues [2]