Yes, Park Seo Joon has completed his mandatory military service in South Korea. He served in the military from 2008 to 2010, fulfilling his duties at a relatively young age before his acting career took off.

Park enlisted at the age of 19, serving as an active-duty soldier in the South Korean army. He completed his 21-month service period without any special treatment or assignment to special entertainment units, unlike some other Korean celebrities.

During his military service, Park maintained a low profile as he wasn't yet a well-known actor. This timing proved advantageous for his career as he could focus on his acting pursuits after discharge without having to interrupt his career momentum later.

The actor has occasionally shared brief mentions of his military experience in interviews, noting that it helped shape his character and discipline. However, he typically keeps details of his service private, focusing instead on his professional work.

For context, military service is mandatory for all able-bodied South Korean men, who must serve between 18 and 21 months depending on their branch of service. Men usually complete their service between ages 18 and 28, though the exact timing can vary.

Park's early completion of military service has allowed him to build his career without interruption, contributing to his steady rise in the Korean entertainment industry since his acting debut in 2011. This unbroken career trajectory has helped him become one of South Korea's most prominent actors today.

I can confirm that Park Seo Joon has fully satisfied his military obligation to South Korea and is not subject to any further mandatory service requirements.

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