SK 21 (working title) is an upcoming Sivakarthikeyan starrer that is written and directed by Rangoon (2017) filmmaker Rajkumar Periyasamy. The movie is a production venture of Kamal Haasan's Raaj Kamal Films International (RKFI) and is touted to be a patriotic drama based on real life incidents. 

As reported previously, SK 21 is gearing up for a title and first look reveal around lead actor Sivakarthikeyan's birthday (February 17, 2024). Latest we hear SK 21's title teaser will be unveiled marking the occassion, though an official confirmation on the same awaits. 

Also starring Sai Pallavi, Rahul Bose, Lallu among others, SK 21 has GV Prakash for music. Sony Pictures is co-producing the film in association with RKFI. 

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[Update: February 12, 2024]

SK 21 title teaser release date and time has been officially announced as February 16, 2024 (Friday) at 5 PM. The video is dropping ahead of Sivakarthikeyan's 39th birthday on February 17, 2024.

Hard work-grit and a “can- do” mentality still matters-a great asset now on display…#HeartsonFire #SK21 Title Teaser on 16th Feb at 5pm #Ulaganayagan #KamalHaasan #Sivakarthikeyan #SK21@ikamalhaasan @Siva_Kartikeyan #Mahendran @Rajkumar_KP @gvprakash @Sai_Pallavi92 @RKFI… pic.twitter.com/csFb2BuYDO

— Raaj Kamal Films International (@RKFI) February 12, 2024