Who was the latest K-Pop girl group to perform in North Korea (2018)?

The latest K-pop girl group to perform in North Korea in 2018 was Red Velvet. The South Korean group performed in Pyongyang on April 1, 2018, as part of an inter-Korean concert called “Spring is Coming.”

Red Velvet performed “Red Flavor” and “Bad Boy” at the East Pyongyang Grand Theatre. The event was part of a cultural and diplomatic exchange involving South Korean artists, and North Korean leader Kim Jong Un attended the concert. Red Velvet’s appearance drew particular attention because K-pop performances in North Korea are extremely rare.

The wording “latest” belongs to the historical context of the question: it refers to the most recent performance by a K-pop girl group in North Korea as of that 2018 event, not a permanent ranking that could never change. Red Velvet was also notable as the first SM Entertainment act to perform in North Korea in 15 years, following the group Shinhwa. Member Joy did not take part in the Pyongyang performance because of a filming schedule.