Hej Saroj,
I take it the new picture is also from West Nepal?This is Corydalis filiformis Royle or Corydalis calycina Lidén, two very similar species. The latter lacks a basal pouch to the lower petal and has smaller flowers with comparatively larger sepals.
Your photo shows no basal pouch, which suggests C. calycina, but the sepals are not quite as big as they usually are. But check the stigma to be certain (see Flora of Nepal). calycina has 4 apical stipitate papillae, whereas filiformis has 6 (and check Flora of Nepal)
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