[1] In 1977, K. N. Upreti became the general secretary of Janata Party, Sikkim Unit under Kazi Lhendup Dorjee.
In 1978, he seceded from Janata Party, and joined Sikkim Congress (Revolutionary) (SCR) under Bhim Bahadur Gurung (B.
He served the Minister for Law, Education, Sports, UD & HD, Food & Civil Supplies, Culture, Government of Sikkim (Nar Bahadur Bhandari ministry).
[4] In December 2017, K. N. Upreti joined Bharatiya Janata Party (BJP) with 2 former SDF State Ministers, Ran Bahadur Subba (R.B.
[5] However, in August same year, Upreti transferred to Hamro Sikkim Party (HSP) which was led by Bhaichung Bhutia.
They explained one of the major reasons for quitting from HSP, namely nomination of Bina Basnett as the party president.