This is an adult male. The white wing patch helps distinguish this fairly common winter visitor. These redstarts are classified in the Old World Flycatcher family, Muscicapidae. They are unrelated to North American redstarts which are in the Warbler family, Parulidae. Canon PowerShot SX60.
References:
Brazil, Mark (2009): The Birds of East Asia: China, Taiwan, Korea, Japan, and Russia. Princeton University Press. ISBN 0-691-13926-1
Collar, N. (2019). Daurian Redstart (Phoenicurus auroreus). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/58501 on 2 April 2019).