Ji Dong-won is officially a Sunderland player after signing a three-year contract on Wearside.
The 20-year-old striker, who has scored six goals in 11 appearances for his native South Korea, joins from K-League side Chunnam Dragons for an undisclosed fee.
Dong-won scored four goals at the 2011 Asian Cup, marking him out of one of Asia's hottest properties.
South Korea eventually lost in the semi-finals on penalties to Japan, finishing third in the tournament overall.
Dong-won, who stands at almost 6'2", began his career at Gwangyang Jecheol High School before a short spell with Reading during the 2007-08 season.
The frontman joined Chunnam is 2010 and scored 16 goals in 44 appearances for the Dragons, who play in the Korean city of Gwangyang.