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On October 7, 2020, Zhang officially announced the establishment of entertainment company Chromosome Entertainment Group. Through its official accounts on Twitter, Weibo, and Instagram, they revealed its trainee selection program, similar to those of Zhang's current Korean agency SM Entertainment and other artist-training companies known for debuting idols. Several celebrities expressed their congratulatory remarks to Zhang's new venture, including the founder and former CEO of SM Entertainment, Lee Soo-man.