Choi Siwon and Choi Kang-chang-min spent time together.
Super Junior Choi Siwon posted an article and a photo on his instagram on June 24th, "Good to be with Changmin."
The photo was taken by Choi Siwon and TVXQ's Choi Changmin, who are sitting in the passenger seat and smiling brightly, while Choi Changmin is sitting in the driver's seat and taking a chic V-posing. Two people who are known to be close friends usually spent time together.
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About Changmin
Shim Chang-min, also known by his stage name Max Changmin or simply as Max, is a South Korean singer, songwriter, actor, and a member of the pop duo TVXQ.
 Wikipedia