INFINITE and SHINEE are famous for their close relationship between each other as they also promoted around the same time. Member Woohyun and Key even debuted as sub-unit under the name TOHEART back in 2014. Not only that, Woohyun and Minho even mentioned that INFINITE and SHINEE are like a set. Whenever they had overseas schedules, both teams stick to each other and played games together in the waiting room. https://twitter.com/AlwaysIFNT69/status/1626578652401106947/video/1