In his first start following a six-week injury lay-off, Sonny scored the third and fifth goals as South Korea racked up a comfortable 5-0 victory in Laos in Asian qualifying for the 2018 World Cup.
That makes it 16 goals in 47 caps for Sonny.
South Korea now have six wins out of six in Group G in the second round of Asian qualifying. The eight group winners and four best runners-up progress to round three.
Below: A Tweet from the Korea FA's official feed shows Sonny (7) just about to convert for 5-0
Sonny returned from injury with appearances off the bench for us against Anderlecht and Arsenal before flying off for international duty.
He played half-hour in South Korea's 4-0 win against Mayanmar and completed the full 90 minutes in Laos.