On July 26, 2023, BTS' Jin took to the South Korean social media platform, Weverse, and wrote a heartfelt letter to WINNER's leader, Kang Seung-yoon, congratulating him on completing his basic training. He expressed that he had enjoyed the six weeks with the idol. He congratulated Kang Seung-yoon for doing well in his trainee life and asked him to take care while he will reportedly be deployed to another division of the military.Jin and Kang Seung-yoon are currently serving their terms in the military. The BTS member admitted to his mandatory military service in December 2022, while Seung-yoon joined the military service in June 2023.After the ARMYs and Inner Circle (WINNER fans) watched the two idols cordially staying together in the military, they were over the moon. They took to social media to express themselves. One tweeted:(❀❛ ֊ ❛ )♡@lilacblues111OMFGG SEUNGYOON AND JIN???? as an Army and Innercircle myself this is an unexpected crossover So happy seeing them togetherr 🥹 awww~ pic.twitter.com/pnyKabN7Do" target="_blank" title="tweet-url" rel="noopener noreferrer">pic.twitter.com/pnyKabN7Do263OMFGG SEUNGYOON AND JIN???? as an Army and Innercircle myself this is an unexpected crossover 😂 So happy seeing them togetherr 🥹 awww~ pic.twitter.com/pnyKabN7Do" target="_blank" title="tweet-url" rel="noopener noreferrer">pic.twitter.com/pnyKabN7Do"This is so crazy": Fans can't get enough of Jin and Kang Seung-yoon's latest interactionAlong with some pictures, Jin posted an adorable letter for Kang Seung-yoon on Weverse in which he expressed his gratitude to the commanders in the military. He also stated that the duo didn't receive any special treatment. The idol mentioned that their company commander and the commander were good people. In the caption for the pictures, Jin wrote:"Seungyoon-ssi, congratulations on your completion. I enjoyed spending the last six weeks with you. (He’s the cool vocalist of the group WINNER.) You worked hard during your time as a new recruit, and please live well at your new military base as well, sob sob. "I hoped that ARMY and INNER CIRCLE would be happy to see [these photos], so I asked [Seung Yoon] to take a commemorative photo with me. Our company commander and the commander are very good people, so we have been doing well for six weeks (sic)."윤서⁷ (slow)@btsinthemomentjin weverse post pic.twitter.com/7aetR2xVoP" target="_blank" title="tweet-url" rel="noopener noreferrer">pic.twitter.com/7aetR2xVoP5391021669jin weverse post pic.twitter.com/7aetR2xVoP" target="_blank" title="tweet-url" rel="noopener noreferrer">pic.twitter.com/7aetR2xVoPNEHEHEHEHE🦋@Nehehehhe1@btsinthemoment Can we take a moment and appreciate like the fitest seokjin look I mean he is handsome and has a great personality but in military he looks so heartthrob I literally want a man like seokjin to marry I mean just look at him765@btsinthemoment Can we take a moment and appreciate like the fitest seokjin look I mean he is handsome and has a great personality but in military he looks so heartthrob I literally want a man like seokjin to marry I mean just look at himstar_jin@nightstar1201You don't know how long I've been waiting for you!!! our baby Kim seokjin!!!!!and Kang Seungyoon nim, congratulations on your comletion ceremony! pic.twitter.com/e247YVtwBR" target="_blank" title="tweet-url" rel="noopener noreferrer">pic.twitter.com/e247YVtwBR1148300You don't know how long I've been waiting for you!!! our baby Kim seokjin!!!!!and Kang Seungyoon nim, congratulations on your comletion ceremony!😭 pic.twitter.com/e247YVtwBR" target="_blank" title="tweet-url" rel="noopener noreferrer">pic.twitter.com/e247YVtwBRKuu@Ku__jiin🪖🤍#jin #SeungYoon#btsfanart pic.twitter.com/NK2z1B84lI" target="_blank" title="tweet-url" rel="noopener noreferrer">pic.twitter.com/NK2z1B84lI1247391👍👥🪖🤍#jin #SeungYoon#btsfanart pic.twitter.com/NK2z1B84lI" target="_blank" title="tweet-url" rel="noopener noreferrer">pic.twitter.com/NK2z1B84lIe ✦@ggonisaurSEUNGYOON AND JIN BECAME FRIENDS?!?!?! THIS IS SO CRAZY MY BOYS pic.twitter.com/7owDGvg56W11SEUNGYOON AND JIN BECAME FRIENDS?!?!?! THIS IS SO CRAZY 😭 MY BOYS 😭 pic.twitter.com/7owDGvg56Wae — fan account@winkoniversei told y'all seungyoon has a hyung power too bts jin who's a hyung to seungyoon posted him two times today and even said good words about him! twitter.com/winkoniverse/s…8629i told y'all seungyoon has a hyung power too 😭 bts jin who's a hyung to seungyoon posted him two times today and even said good words about him! twitter.com/winkoniverse/s…star_jin@nightstar1201"You did a good job as trainee. You will doing well in your own unit too. 흑흑(heuk heuk. Sobbing = )"Given that he wrote this 흑흑 sound, it seems he miss that Yoon nim will go another unit. Seungyoon nim has been deployed to 6th Division. Yoon won't be in 5th Division.#JIN pic.twitter.com/izU9lmauaj twitter.com/nightstar1201/…14446"You did a good job as trainee. You will doing well in your own unit too. 흑흑(heuk heuk. Sobbing = 😭)"Given that he wrote this 흑흑 sound, it seems he miss that Yoon nim will go another unit. Seungyoon nim has been deployed to 6th Division. Yoon won't be in 5th Division.#JIN pic.twitter.com/izU9lmauaj twitter.com/nightstar1201/…𝑵𝒊𝒛@dblueseokjeans@nightstar1201 Ohmygosh i like winner too! And it still feels like a dream to have a little bit crumbs of them selfie together like this🥹🥹And seokjin looks so healthy too393@nightstar1201 Ohmygosh i like winner too! And it still feels like a dream to have a little bit crumbs of them selfie together like this🥹🥹And seokjin looks so healthy too💗yely⁷@bichwithe whole tl after not seeing jin for WEEKS pic.twitter.com/CsxZZ4rZnj39371310the whole tl after not seeing jin for WEEKS pic.twitter.com/CsxZZ4rZnjAfter watching the pictures and videos uploaded by BTS' Jin, ARMYs were elated to see that the idol is doing well and seems healthier than ever. They gushed over him in his uniform attire and loved how handsome he looked.Some fans also noticed that the Epiphany singer might be sad about Kang Seung-yoon's departure as he is reportedly being transferred from the 5th to the 6th division. As a result, he won't be able to interact with him, which may create a sense of emptiness around him in the military.Hourly Jin 👩🏻‍🚀@hourjinnieSEOKJIN CAME HOME IM CRYING pic.twitter.com/300T0RpFCH" target="_blank" title="tweet-url" rel="noopener noreferrer">pic.twitter.com/300T0RpFCH64091658SEOKJIN CAME HOME IM CRYING 😭😭😭😭😭😭😭 pic.twitter.com/300T0RpFCH" target="_blank" title="tweet-url" rel="noopener noreferrer">pic.twitter.com/300T0RpFCHMeanwhile, Inner Circle members were also elated to learn that Kang Seung-yoon was accompanied by Hyung (older brother in Korean). Meanwhile, BTS member Jungkook also commented on Jin's Weverse post, stating, "That's awesome." Fans were also happy to see Jungkook and the Epiphany singer's brief interaction on social media.The Epiphany singer is set to complete his mandatory military service by June 2024, while Kang Seung-yoon will complete his military service in the second half of 2024.