ATBO's Jeong Seunghwan, officially began his mandatory military service on Monday, October 20, 2025. The news was confirmed directly by IST Entertainment, which said Jeong Seunghwan had registered at the Nonsan Military Training Center on the same day.
The agency explained that the decision not to announce the schedule in advance was taken as a form of respect for Jeong Seunghwan's personal wishes, who wanted to depart quietly without the public spotlight.
“Jeong Seunghwan has officially started his military service today (October 20, 2025) at the Nonsan Military Training Center. "In accordance with his wishes for a peaceful departure, we did not share this news earlier.
We ask for fans' understanding," wrote an agency representative on Tuesday, October 21, 2025. Furthermore, the agency also added that Jeong Seunghwan will undergo basic military training before continuing his active service.
He is determined to carry out his duties responsibly and return as a more mature person. "Jeong Seunghwan will carry the love and support of fans throughout his service.
We ask for your warm support and encouragement so that he can complete his military service healthily," concluded IST Entertainment. With this, Jeong Seunghwan became the first ATBO member to undergo military service.

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