Seungri mentioned Taeyang's birthday being tomorrow, so they started singing Happy Birthday :) ^^.
Congratulations: BIGBANG 6th win on SBS Inkigayo for LOSER:
G-Dragon Thank you Speech:
"Those who came here, thank you and thank you all who love our songs. Thank you VIP". I'm also thankful to the artists who have been with us, thank you all. We will work hard"
(translation via @Shrimpljy)
From Press:
Source: http://article.topstarnews.net/detail.php?number=129159#cb
Report on Pre-Recording:
Leaving Inkigayo:
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[Photos | Videos] BIGBANG at SBS Inkigayo Pre-Record 2015-05-17