Name the first modern Hindi novel which became the best-seller

Name the first modern Hindi novel which became the best-seller. Who was its writer? Why was it so popular?

The first Indian novel in Hindi which became the
best-seller was Chandrakanta, written by Devaki Nandan Khatri a romance with the dazzling a element of fantasy.
It is believed to have contributed immensely in popularising the Hindi language and the Nagari script amongst the educated classes. Although it was written purely for the pleasure of reading, this novel also gives some interesting insights into the fears and desires of its reading public.