Su Tseng-chang was appointed as the Prime Minister of which country?

Taiwan President Tsai Ing-wen has appointed Su Tseng-chang as Prime Minister, during a Cabinet reshuffle following the ruling Democratic Progressive Party's heavy losses in local elections. Su is a former premier appointed in 2006 by then-President Chen Shui-bian and was a chairman of Tsai's Democratic Progressive Party for two terms. His appointment follows the widely-expected resignation of William Lai, the second premier to quit since Tsai took office in 2016.