Dayahang was born on April 13, 1980 in a remote village in Bhojpur district in Eastern Nepal. He belonged to a middle-class family of seven members. His father had two wives. Dayahang has two younger sisters and an elder brother - Bidur Lamichhane Rai. Dayahang completed his lower secondary-level study from Pashupati Lower Secondary School in Khawa VDC, Bhojpur district and his high school from Annapurna Secondary School, Dilpa in 1998. He was inspired by his mother who used to narrate him numerous fairy tales in his childhood. Dayahang started acting from his schooldays. He completed his intermediate-level studies at Bhojpur Multiple College, with geography as the major subject. He came to Kathmandu in 2001 and joined the Nepal Maanawiki Campus (then RR Campus) as a journalism major. He could not do well in studies. He then moved towards theatre and stage shows.