一位女歌手在目睹其一位歌迷诡异自尽后，身边开始出现各种奇怪的微笑现象，其歌迷纷纷精神失常，开始疯狂地微笑，对女歌手穷追不舍。

In Nightwatch the sequel, Emma, a medical student, takes on a nightwatch job in the forensic department. And it is no coincidence. Since the fatal nig