BoA posted a photo of a letter addressed to her from U-Know Yunho on Instagram on August 28, writing "It′s been a really long time since I wrote and received a handwritten letter.. Friend~~ Thank you for writing back!! Take care of yourself!!!! #SoldierFriend #MyFriendYunDori."
U-Know Yunho enlisted in the army on July 21 and will be serving as an active duty soldier for 21 months.
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