It looks like it was taken after the boys held the TVXQ! Asia Press Tour in Japan ^^*

Translation:

How To TOHOSHINKI CHANGMIN 2017/9/27

Tsutsumi (T): Hello everyone, I am Tsutsumi of Dorians.
A little while ago, the press conference of Tohoshinki (announcement of restarting their activity) has finished and I heard that Changmin is waiting for me in this room. Shall I get in here?
This way, right?
HAHAHAHAHAHAHAHAHAHAHAHA

CM: Oh..
T: Changmin!
CM: Yes I heard about (you).
CM: What did happen to you? Why are you speaking so loudly? What is about your outfit!?
T: I changed my clothes.
CM: I am asking you why did you change your clothes to this outfit!?
T: You finished your press conference, and now I am ready to ask you questions. So I made myself look like Changmin.
CM: Well.. I was not expecting that I still have such a weird filming left to do.. A little while ago, staffs told me to stay in this room and wait for someone. I thought why only myself? The two of us just announced that we’ll restart our activity together, and we did out best to look cool at the press conference. I was wondering whether they were teasing me or giving me some hard time.
T: No-no. You are awesome at your press conference.
CM: Why are you wearing this outfit?
T: This is my own T-shirts from WITH concert. I trimmed the sleeves to look like the one you were wearing. I grew my hair longer like you.
CM: oh, so your hairstyle is like my hairstyle two years ago.
T: Yes! you are right!
CM: Certainly, I remember that I cried in this hair style. I remember that.
T: Hahaha. Yes, You held Yunho like this.
CM: Please do not cry. do not cry.
T: Welcome back!
T: I am so happy! All Bigeasts were waiting for your return.
CM: Thank you! I did not realize that Tsutsumi-san had this ulterior motive.
T: Sorry
CM: no apology
T: So this time, you will restart your activity. Previously when Yunho resumed his activity, I gave him questions from Bigeasts.
CM: Ah~ yes, yes.
T: Today, it is your turn and I will give you questions from Bigeasts. Is that okay?
CM: Yes. Please take care of me.
T: Yes, okay. then please sit down.

T: Today, I have a lot of questions that I got from Bigeasts for you.
CM: I see.
T: There are amazing numbers of questions.
CM: is that so? Can you reduce the number of questions?
T: Hahaha We don’t have enough time to go over all questions. So we picked most asked questions.
CM: Thank you!

T: The first question is, “Have you done something not to forget about Japanese?”
CM: Well, in the beginning, I planned to study about easy Kanji – Chinese characters. I did not study all the time but on occasions, I did study. I watched Japanese TV dramas, I listened to Japanese songs.
T: Oh, so when you find some free time, you studied Japanese.
CM: Yes, yes, yes.
CM: When I was off, I tried.. I read lyrics of old Tohoshinki songs and tried not to forget about them. I tried to read a bit by bit. something like that.
T: Wow, really? I am so happy to hear that.
T: I actually asked the same question to Yunho.
CM: Oh..
T: When Yunho was off duty, he became a teacher and taught his colleagues Japanese.
CM: Oh..
YH: Well, I heard my name. What are you talking about me? Hello. What are you talking?
YH: Oh, Changmin (hitting the shoulder of Tsutsumi-san & shaking hands with T)
YH: Wow, Changmin!
YH: Wow Changmin is here.
T: There are two Changmins here
CM: No, there is only one!
T: Hahaha
CM: I am the real Changmin!
YH: What are you doing here?
T: I am asking him questions!
YH: questions?
T: Remember, last time, I asked you questions?
YH: When?
T: A while ago!
YH: Hahaha
T: in Korea!
T: Today, I am giving Changmin questions from Bigeasts.
YH: To Changmin
T: Do you want to join us?
YH: Okay, you two have good time! I am leaving! Bye!
T: hahaha
YH: Go Changmin!
CM: He really is a great help!
T: Yes, You can count on him!
CM: He is so easy going!
T: Yes!
T: Look he is leaving so quickly.
CM: Bye-bye!

To-be-continued.

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Credits:

Bigeast Official Website,
Video by @smilessi of TVXQ! Express,
Video Translation by @beriko0214: here or here,
Posted and Shared by TVXQ! Express