Watch Sajan Full Movie Free Online 123Movies. Prakash (Ashok Kumar) is returning home after eleven years from UK, and is now on a train for his journey back home. He meets a young man, also called Prakash (Ramesh Gupta), on the train who befriends him. The train meets with an accident and Prakash loses his memory. While Prakash is wandering around trying to regain his memory, the man from the train thinking that Prakash (Kumar) is dead, pretends to be Prakash and reaches his house.