Taguchi Junnosuke (ex-KAT-TUN) took a picture of the Tohoshinki Begin Again album release ad up at Shibuya’s Hachiko exit, and posted welcoming them back ^^.
Both seem to be friends. For example, back in 2013 on Kings Brunch, Changmin revealed that when Junnosuke came to Korea, they had barbeque together.

https://www.instagram.com/p/BaTQnJvneGw/

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Credits:

junnosuke_official: here via @snxy,
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