BLACKPINK‘s Jennie and NewJeans had the most unexpected interaction. BLACKPINK’s Jennie | @jennierubyjane/Instagram The members of NewJeans | @newjeans_ADOR/X Between 4-6 October, 2NE1 started their Welcome Back tour with shows in Korea, and unsurprisingly, the list of celebrities and K-Pop idols attending was huge. In particular, both Jennie and NewJeans were spotted at the October 6 show,…