Kaun Ho Tum (1970)

Prakash (Sailesh Kumar) is in love with Kamini (Sonia Sahni), but due to his being from a poor family, Kamini's father is against their marriage. Prakash's best friend, Mohan (Jagdeep), vows to help the couple and while the duo are travelling to the hill station that Kamini and her father are visiting, they meet with an accident and Mohan dies. When Prakash arrives at the hill station he is shocked to find Mohan alive and well and romancing Kamini. Confused and distraught, he confronts Kamini's father with this news. The father attacks Mohan and, in self defense, kills him. Prakash and the father then travel to Mohan's home to break the news to the boy's mother...and find Mohan, once again, alive and well.