Question

what is BT21? Who is known as South Korea's nation's sisterm​

Answer 1

Answer:

Hope it's correct

thank you

Answer 2

Answer:

hope this will help you sister !!

Explanation:

Lee Ji-eun, known professionally as IU, is a South Korean singer-songwriter and actress. The name IU is a combination of 'I' and 'you' meaning "you and I become one through music." She signed with Kakao M in 2007 as a trainee and debuted as a singer at the age of fifteen with her first mini album Lost and Found.