Celtic striker Oh has detailed his disappointment at his South Korea debut on Friday after he failed to score in a 1-0 loss to Peru.
Oh has blossomed at Celtic since joining as Giorgos Giakoumakis' replacement in the winter, notching seven goals in just 21 games - with the majority of those being bench appearances - to mark his name in the Scottish Premiership.
It's been a rapid rise for the youngster, who alongside fellow stars such as Hwang and Lee Kang-in, fell short to a Bryan Reyna goal. But whilst there will undoubtedly be more appearances in the future, the Parkhead favourite was left annoyed with his performance by brandishing himself as 'ashamed'.