Jan. 14, 2010
See these ad posters of BYJ for 'Visit Korea 2010-2012' when you're in South Korea.
First in South Korea Subways (Uruchiro)
Source: BYJFan/Free 10.01.11 05:13 (many thanks sis)
Then on the bus.
Source: BYJFan/다롱이맘 10.01.14 01:51 (lots of thanks :)