Who is the biggest brand ambassador in K-pop?

Can anyone shed some light on who the most prominent brand ambassador is in the world of K-pop? It's intriguing to think about which artist has the strongest influence and partnerships, shaping the industry and attracting a vast audience. Is it perhaps a member of a top-tier group, renowned for their charisma and global appeal? Or could it be a solo artist who has broken through the noise with their unique talent and style? The K-pop landscape is vast and ever-evolving, so it's fascinating to speculate on who holds the title of the biggest brand ambassador.