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Jimin, Jin, and J-Hope left messages of thanks to their A.R.M.Y on BTS' twitter:

Jimin tweeted, "I arrived in South Korea today safe and sound~ Home is definitely the best!! kekeke Also, today is our 400th day!? Time flies but flies so quickly.. Thank you to all of the fans who always love us."

Jin tweeted, "A.R.M.Y~ 400 days! Thank you so much for staying with Bangtan for a long, long time?? Let's spend more time together. I'm watching you."

J-Hope tweeted, "Everyone, [it's our] 4...0.0... day ehha!!! I'm doing a three-line poem using the word 'Sa Baek Il' (400 days). Sa Saranghaeyo [I love you] A.R.M.Y. Baek Bun (100 times) I may say it, but it wouldn't be enough. Il....... Il cause you oh my girl~~~ Please fill in the 'il' for me. Anyways, I love you A.R.M.Y."

Congrats on your 400th day, BTS and A.R.M.Y!