The first one was posted at November 8th, including tweet: “광화문에서” which means “At Gwanghwamun”, his entitled Album.
And Ryeowook replied without mentioning him with: “광화문에서 ?! 홍콩에서 ^^”, which means: “At Gwanghwamun?! (its) at Hongkong^^”. Ryeowook also posted 3 selfie photos with Kyuhyun, Kangin, Heechul. Here the tweets^^
The second one was posted at November 9th: “뒷 모습이 참 예뻤구나..” referring to the lyric he sings on the video which means: “Your back view is really pretty”
And the third was posted at November 10th. He said: “깊은 밤을 날아서~ ^^” which means: “Words that hidden in love~ ^^”
And the last one was posted at November 11th, which means: “One confession”