Koda Kumi shared 2 photos with TVXQ on her Instagram.

She attended TVXQ's "TOHOSHINKI LIVE TOUR 2019～XV～"s Tokyo Dome stop and shared her feelings:"Congratulations on your 15th anniversary!! I was so moved and I cried. I cried a lot! There are really so many changes, growth and pain."

She continued, "I met TVXQ when we collaborated on  my “Last Angel", which was 12 years ago. It was my first time to see the live at the dome, and I was really grateful. In the future, please continue to attract the audience with the cool TVXQ sound!”

As for TVXQ's live performance, she said, "The sound, visual and singing voice of them have changed to the coolness of adults, and this time they are cooler. As much as their sound, their dance were amazing. The ballads touched my heart. They are really amazing at live shows. 

TVXQ was featured in Koda Kumi's song and MV "Last Angel" in 2007.

Other than Koda Kumi, various artists attended TVXQ's concert in Japan.

Boy group SOLIDEMO's Mukaiyama Takeshi, who has also described himself as a big fan of TVXQ many times, attended the concert, tweeted about it and shared 2 pics: 

"#TVXQ LIVE TOUR 2019 #XV is here!

Tokyo dome has become a red ocean🔥

Everytime I see your live performance, I learn that not only songs and performance are important, there are some more important things!
I would like to express my gratitude to the 2 people around for respecting each other! Also MC had a great time
We are T〜🔥"

Hi-Hyunk of BACK-ON posted a pic with TVXQ on his blog and said, 

"I attended TVXQ's 'LIVE TOUR 2019～XV～ in Tokyo Dome!! Their songs, voices, dances.. The sound of fanchants in the dome.. I was really impressed and it gave me goose bumps. 

Their live performances are very cool!

'Continuation' and 'evolution'

Thank you!

Watching 2 people's live makes you feel what 'strong' means. I felt it.

Your music is the best!!

Singer and song writer Tsukiko Nakamura tweeted,

"TVXQ LIVE TOUR 2019〜XV in Tokyo Dome.

I was really impressed by the fiery passionate stage! !

Amazing stage. I was impressed by the happiness that everyone could listen to, and I felt joy!
I'm really thankful to you! !"

Pianist Mami Yamada tweeted, 

"I was so fascinated. When I saw the 2 people, so many words circulated in my head. I will never forget the sound of the applause for 2 fireflies' tears and songs. I will never forget it! TVXQ's live was really impressive!!"

GOETHE Magazine's writer Ryosuke Nihonyanagi tweeted,

"#TVXQ's live was great! The one and only. Their perfect combination, strength and humble hearts attracted a lot of spectators. The unity between them and their fans were incredible.

DJ&MC Minsil tweeted,

"I attended TVXQ's Live Tour 2019 XV's Tokyo Dome concert. I already heard how good they are but it was really amazing. Their live shows are evolving rapidly to the next stage.It was full of hard work, the bond between the staff and them... Fans... I was so excited."

Column writer Chie tweeted,

"I went to TVXQ's Tokyo Dome concert. I say this everytime but this time was also a masterpiece. It was amazing. I was so impressed by their attitude. Don't forget to support them, don't forget their influence. They are the real stars."

Source: e-talentbank.co.jp,