柠檬仔”与“赛米”获选为第一代香港“阳光警察”，并频频登上媒体头条。由于实战经验不足，被其他同事嘲讽。因偶立新功，名声大振，又被黑社会迷昏后剥光衣物关入铁笼扔在闹市，令警方出丑。在家人、朋友的支持下，二人重新振作起来智斗匪徒，让“阳光警察”更加深入人心…

為重建活力新形象，警隊精挑檸檬仔及Sammy 為「陽光警察」，但卻受市民的歧視及狗仔隊的滋擾，效果適得其反，計劃迫於終止，後他倆遇上一大型綁架行動，終發揮陽光警察的精神…

Various government departments of the Hong Kong Special Administrative Region have been criticised heavily by the public. The Commissioner welcomes the proposal of "Sunshine Cops" from public relations officer Geena to enhance the image of Hong Kong's finest. Both Lemon and Sammy have recently completed their Police Tactical Unit (PTU) training. They look like movie stars and are fit and ready to conquer the world. They are selected to represent PTU in the internal audition for "Sunshine Cops" and contest against elite from other units like Criminal Investigation Department and Task Force, etc. The competition is tough but they prevail.