He served as the acting Prime Minister of Nepal upon the demise of his elder brother Bam Bahadur Kunwar from 25 May 1857 to 28 June 1857.
[1] Kunwars came to political power being close relatives of the same Thapa family.
[4] In the aftermath of the massacre, Jung Bahadur appointed his brothers and nephews to the highest ranks of the government.
He served as the Chief Administrator of Morang, Saptari, Parsa, Bara, Rautahat and Sarlahi districts in the year 1849.
[citation needed] He served as the acting Prime Minister of Nepal upon the demise of his elder brother Bam Bahadur Kunwar from 25 May 1857 to 28 June 1857.