GD X Taeyang (also known as GDYB) is a South Korean duo from YG Entertainment, consisting of G-Dragon and Taeyang from Big Bang.
An official collaboration between the two as the subunit GD x Taeyang emerged in 2014 with the song "Good Boy," which reached number one on Billboard's World Digital Songs, making it the third time a Korean act had topped the chart after PSY and 2NE1. The single accrued 1.2 million downloads in South Korea, and its music video accumulated over 100 million views on the video-sharing website YouTube.