Long Zhang is a celebrated screenwriter whose work has left a significant mark on contemporary cinema, particularly among physical media enthusiasts. One of his standout films, *Knock Knock* (2021), showcases his knack for weaving suspense and psychological intrigue, capturing the attention of both fans and critics alike. This film not only features a gripping narrative but also boasts a unique visual style that makes it a sought-after title for collectors seeking to enhance their home video libraries. Collectors are drawn to Zhang's films not just for their entertainment value, but also for their cultural relevance and aesthetic appeal. The limited edition releases of *Knock Knock* have become particularly prized, often featuring exclusive commentaries and behind-the-scenes footage that offer deeper insights into his creative process. As physical media continues to thrive in the age of streaming, Zhang's contributions stand out, making his works essential additions for any serious collector looking to celebrate the art of film.