This contain an image of OnlyOneOf's Rie, age 28, Former Stray Kids member Kim Woojin, 26,TAN's Sunghyuk, 25 .

4th Gen Kpop Stars OnlyOneOf Rie And TAN Sunghyuk Begin Military Service

Triple K-pop Enlistment

The K-pop world witnessed a unique moment as three 4th gen K-pop idols began their mandatory military service today. OnlyOneOf’s Rie, TAN’s Sunghyuk, and soloist Kim Woojin started their journey on January 20, 2025. All three will serve in military bands after completing basic training. This synchronized enlistment has caught the attention of fans worldwide, marking a special day in K-pop history.

This contain an image of the three 4th gen K-pop idols

OnlyOneOf’s First Military Goodbye

OnlyOneOf’s Rie, age 28, marks a significant milestone as the first member of his group to enlist. The talented idol, who debuted in 2019, will showcase his musical skills in the military’s army band. 

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His temporary departure brings a bittersweet moment for fans who have supported him since debut. Before enlistment, Rie participated in several special fan events and recorded content for fans to enjoy during his absence. The group’s agency confirmed they would continue activities with remaining members while supporting Rie’s service.

This contain an image of OnlyOneOf's Rie, age 28

TAN’s Musical Connection

TAN’s Sunghyuk, 25, brings an interesting twist to his military service story. He’ll join the 7th Army Corps Band, where his groupmate Jooan currently serves. This special arrangement allows the two TAN members to maintain their musical bond while fulfilling their duty to their country. 

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Fans expressed joy at the possibility of seeing both members perform together during military events. The group’s recent comeback showcased Sunghyuk’s improved vocal abilities, which will surely benefit his military band performances. Their agency revealed that special video messages from Sunghyuk will be released periodically to keep fans updated.

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This contain an image of TAN's Sunghyuk, 25 that is about to join the 7th Army Corps Band

Kim Woojin’s New Chapter

Former Stray Kids member Kim Woojin, 26, completes this musical trio of enlistments. After his 2018 debut with Stray Kids and later success as a soloist in 2021, Woojin now embarks on this new journey. Like his fellow enlistees, he’ll contribute his talents to the army band. His final solo concert before enlistment sold out within minutes, showing his strong fanbase support. Woojin promised to return with new music and expressed gratitude to fans for their continuous support throughout his career changes.

This contain an image of Former Stray Kids member Kim Woojin, 26

Military Band Service Details

All three idols will undergo six weeks of basic military training before joining their respective military bands. The military band service allows them to continue using their musical talents while serving their country. They’ll participate in various military ceremonies, events, and special performances throughout their service period. This assignment is particularly suitable for idols, as it allows them to maintain their vocal abilities during their service.

This contain an image of All three idols will undergo six weeks of basic military training before joining their respective military bands

Final Thoughts: A Synchronized Return

All three idols chose similar paths for their military service, focusing on their musical abilities. They’re expected to return to their eager fans on July 19, 2026. Their agencies have prepared content banks to keep fans engaged during their absence. This unique coincidence of three 4th generation idols enlisting together has created a special bond among their respective fandoms. 

This contain an image of TAN's Sunghyuk, 25
This contain an image of OnlyOneOf's Rie, age 28
This contain an image of Former Stray Kids member Kim Woojin, 26

What are your thoughts about these synchronized enlistments, Seoul Crushers? Share your wishes for their safe service in the comments below!

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