Gun Metal Grey is a 2010 Hong Kong police procedural television drama produced by Television Broadcasts Limited. It originally aired on Jade from 1 November to 10 December 2010, consisting of 30 episodes. Gun Metal Grey is a dramatisation and fictional telling of Hong Kong's top ten criminal cases, which tells about the complexities of human nature and the strangeness of truth. Gun Metal Grey is written by Lau Choi-wan and Leung Yan-tung, with Terry Tong serving as the executive producer. The drama is one of two grand TVB productions to celebrate the channel's 43rd anniversary, the other being No Regrets, both were the first to be broadcast live in English subtitles. The Chinese title of Gun Metal Grey literally means "criminal police", which can also be used to a describe a cop who commits a crime. During early promotions for the drama, the year "2010" was attached to the Chinese title to prevent confusion with previous dramas of a similar title. The English title is a wordplay on the colour of guns, a representation of criminal justice, and Felix Wong's character Stone Sir, a cop who finds himself trapped in a grey area of morality.

Disaster is looming in gangland because of a murder case. Cheung Sai-lun, Chinese American drama fanatic, returns to Hong Kong to look for opportunities in showbiz. Sai-lun somehow encounters a policewoman called Koo Yan-yee, who gives him an important assignment that requires him to pretend to be an orphan of Big Boss of Union Gang. With the assistance of a seasoned decoy called Ko Bun, Sai-lun becomes Big Boss. Sai-lun then repeatedly offers help to gang leader So Tsz-shan and an actress by the name of Chong Ming-lai. You Ching-shui, lady boss of some nightlife venue, and a trio of unrelated fresh-faced ladies also keep clinging to Sai-lun. While Sai-lun is starting to venture into gangland, he and Ko Bun become amicable partners. And with absolute protection provided by formidable fighter Luk Chau, crises are overcome. But nobody is aware of some shocking scheme has been awaiting him behind the gang activities.

Bo, a cheerful girl from Mong Kok, meets wealthy Edward, who hires her to sabotage his father's wedding. As they fall deeply in love, their romance faces unexpected challenges that test their bond.

马伟雄（沈震轩 饰）是一名编剧，长久以来，他和女友白玫瑰（庄思敏 饰）一同过着地位悬殊的生活，这让永远处于食物链最底层的马伟雄苦不堪言。某日，白玫瑰的妹妹白菊花（连诗雅 饰）出现在了马伟雄的面前，重新点燃了他内心里的冲动与激情。陈勇胜（张建声 饰）于夜场之中遇见了美艳不可方物的潘小姐（倪晨曦 饰），深深被其吸引的他却意外得知潘小姐即将嫁人。叶礼信（陈奂仁 饰）遇见了曾经的补习班学生谢美金（蒋家旻 饰），没想到后者居然开口向她借贷巨额钱财。 一场追悼会将三个素不相识但同样为情所困的男人牵到了一起，开诚布公的倾诉能否治愈他们内心里共同的伤痛？

阿宝（蒋家旻 饰）的母亲被确证患上了急性肾衰竭，唯有换肾才能够保命，然而，阿宝贫寒的家境却根本无法承受高昂的手术费用。无奈之下，阿宝找到了邻居芸姐（陈敏芝 饰），求她帮忙，在芸姐的建议下，阿宝最终无奈的同意利用自己的身体换取金钱。 阿强（马志威 饰）是阿宝的男友，尽管他明白阿宝的处境，亦决定尊重阿宝的决定，甚至陪她上下班，但他无法控制自己心里渐渐滋长的妒火，最终矛盾爆发，两人不欢而散。之后，阿强得知了阿宝母亲去世的消息，与此同时，阿宝亦被亲戚收养，从此了无音信。一晃眼多年过去，阿强成为了一名发型设计师，在一次工作中，他意外的和阿宝重逢了，往日的种种浮现心头，两人心中百般感慨。