Ugyen Tendhar Gyaltshen was born in 2009 in Bhutan. At the age of two and half, he was recognized by H.H. Dodrupchen Rinpoche as the reincarnation of the late Lama Chokey Nyima of Serang Gonpa, who was commonly known as the Nubri Lama. He was bestowed a new name – Kuenzang Drodul Wangpo. In 2012, H.H. Dodrupchen Rinpoche performed a simple long life ceremony and made offerings of robes to the young Tulku, which were followed by an enthronement ceremony at His Holiness's main seat of Chorten Gonpa, Sikkim.
Yangsi is currently being educated at Chorten Gonpa under the care of H.H. Dodrupchen Rinpoche and H.H. Lopon Rinpoche. Yangsi receives teachings from senior Tulkus such as Gonpo Tulku and Khenpo Thinley and other senior monks. Yangsi will be the future Dharma holder of Serang monastery.