如果說《金都》是一個想觀眾看完出去就會離婚分手的電影，《填詞撚》就是一個希望觀眾看完就會放棄夢想的故事。

缉毒总督察李振邦（张家辉 饰）和卧底警员江铭（陈伟霆 饰）秘密执行追捕毒贩计划，无奈遭遇险境，江铭被迫游走黑白边缘，逐渐失控。为坚守底线，昔日队友互生杀意。猜忌、愤怒、疯狂、失望……全员丧失理智，濒临崩溃边缘！

主要講述中文老師盧文達（劉俊謙飾演）奈何教績強差人意，教學生涯一直徘徊在淘汰邊緣。同時校長（智叔飾演）計劃將學校轉為直資學校，而出身清貧、曾受惠於學校創辦人有教無類宗旨的林副校（秀雯飾演）認為此舉有違書院的辦學理念，不想讓學校變成貴族學店而設法阻止。於是她以轉長約為條件成功威逼利誘盧文達為她效命，暗中施計企圖拉倒轉直資的方案。

In one of his finest dramatic performances yet, Louis Koo stars as a veteran ambulanceman who simply wants to do his job without any interference from his boss. While he considers emigrating with his daughter, he clashes with his new partner, a young go-getter on the fast-track up the bureaucratic ladder. A mature directorial effort by Cheuk Wan-chi, this dramedy about Hong Kong’s civil service culture and the latest emigration wave is a charming, yet sobering love letter to her city and its people, especially those who still remain.