On December 27, Sechskies revealed a trailer for their upcoming movie/documentary 'Sechskies Eighteen', looking back on their 18-year history as K-Pop idols.

SEE ALSO: NewJeans member Hyein's cryptic post raises eyebrows amid HYBE-ADOR conflict

The movie will illustrate Sechskies, not as a '1st-gen' idol group but a revamped '2017 idol' group.� The clip contains footages of the members pouring their heart and soul into preparing for their 20th-anniversary concert.� Like the title, avid fans will get to relive Sechskies' 18-years together and is expected to stir up many different emotions.

Meanwhile, 'Sechskies Eighteen' will premiere on the big screen on January 18 next year.

Check out the nostalgic clip above!