Korea's Front man

K-media reported on "Korea's Frontman" Jimin representing Korea as the face of the Korean tourism industry, by contributing to strengthen the local economy with his influence as a world-renowned artist

Jimin is drawing attention by being used to promote tourism in Busan & Seoul.

Front man is someone who represents something to general public who are not familiar with.
It's not a nickname that can be given by one's own company or old fans. It represents the impact of the individual to general public.