Write a short summary of what happens in the film

This is a story of Tyagi Sir - a biology teacher just 2 years away from retirement. The film starts on 21st Mar 2020 - the day India announced 1 day of lockdown and then extended it for 5 months. In the film, Tyagi sir's world changes overnight, as schools go online. We see him struggling. His family tries to help and keep him happy. He is hoping for lockdown to end so that he can go back to school. The day lockdown is removed, he gets to know that online school will continue for 6 more months. This is the day when all his hopes are shattered and he types his resignation letter. He receives a call from one of his ex-students, who is now a doctor thanking him for his contribution in his life. Shaken, Tyagi sir, decides to master technology and new ways of teaching.