As the late Moonbin of the group ASTRO has left this world, his colleagues have written heartfelt letters in his memory.

A memorial space for the late Moonbin has been set up in front of the Fantagio office in Gangnam-gu, Seoul. This space is open for visitation until the 30th, and Fantagio has announced that they will carefully preserve all the gifts, letters, and notes left in the memorial space without any damage.

Fans and fellow entertainers, including ASTRO members, have visited the site to leave handwritten letters mourning the deceased.

SEVENTEEN's Wonwoo wrote, "Bin, it's your brother. The kindest and coolest Bin in the world. When I was breaking down, you came running to me first, but I didn't even know about your struggles. I'm sorry."

He continued, "Your image of always being gentle and kind, exercising with me, and comforting me is still so vivid that my heart aches. But I'll live with the ASTRO members in an interesting way, working hard on your behalf, and I'll tell you many stories when we meet again. Please tell me a lot of your stories then."

Mingyu wrote, "Bin, hi. Thanks to you, I've come to your company. My biggest memory with you is talking together until morning. Do you remember? The only thing I could say to you, who had so many worries and concerns, was 'Where else can you find an idol who's good at everything like you?' I'll work harder! Don't be in pain anymore, and smile more. I'm sorry... you worked hard, my friend." He expressed his grief, saying, "Next time we meet, I'll buy you fish cake soup with soju! Please support your members from afar. And my favorite song is 'Waterfall.' Let's be happy, my friend."

Woozi conveyed his longing for Moonbin through a personal social media post, saying, "I miss our Bin so much." He recalled memories with the deceased, saying, "Just a week ago, you told me with an unusually bright smile that I was your top priority and that we should make time to dance together. This world is so cruel, right?"

He expressed regret for not being able to say more nice things, saying, "I don't think I've ever had a younger brother who liked me as much as you did. I don't think I'll have one in the future either, so my feelings of cherishing and treasuring you are growing, but I don't know what to do."

Members of the group Billlie, Moonbin's younger sister Moon Sua, ASTRO's Cha Eunwoo, MJ, Jinjin, SEVENTEEN's Boo Seungkwan, Weki Meki's Choi Yoojung, and others have also left letters mourning the late Moonbin.

Billlie will continue their schedule as a six-member group without Moonsua. Moon Sua, who has been active as a 'Show Champion' MC with fellow member Tsuki, will not participate in Billlie's fan signing event schedule, as Tsuki will handle the MC schedule alone due to Moonbin's passing.

The group Viviz, who said goodbye to their colleague ASTRO's late Moonbin, announced the cancellation of their schedule on the 25th. Member SinB was known to be a close friend of the same age who had a long-standing friendship with the late Moonbin since childhood. SinB silently conveyed her condolences by following the late Moonbin's personal social media account.

Meanwhile, Moonbin gained attention as Little TVXQ in the 2006 TVXQ music video for "Balloons." Moonbin, who was active as a child actor, made his debut as a member of the idol group ASTRO in 2016. Recently, he met fans through the team's unit Moonbin & Sanha.

Moonbin passed away on the 19th. Following the wishes of his family, all funeral proceedings were held privately, and the farewell ceremony took place on the morning of the 22nd.