noun
two-part work; dilogy
Used for creative works such as novels, films, or albums that are released in two parts.
この映画は二部作の前編です。
This movie is the first part of a two-part series.
彼の新作小説は二部作として出版された。
His new novel was published as a two-part work.
前編 refers to the first part of a multi-part work, often used together with 後編 (latter part).
Compound of 二 (two), 部 (part), and 作 (work).