Mandatory military service at 18: a discussion lesson that lands differently in Korea
A 45-minute debate on lowering the conscription age to 18, designed for Korean high school boys who will serve and girls who won't—and the four discussion tasks that keep it from going silent.
Park English · 2026-08-23 · 4 min read
Print it out
No sign-up, no email. Opens a clean print page.
Most debate topics you pull off the Internet feel like homework. This one doesn't, because half your students will be filing their enlistment paperwork in under three years and the other half won't ever go.
South Korea requires military service of all able-bodied men, usually between 18 and 28. The debate about lowering the minimum age to 18—right after high school—comes up every few years, loudest when birth rates drop or when a defence minister floats the idea in parliament. It came up again in late 2023. Your students have opinions on this already, and if you teach boys and girls in the same room, those opinions do not line up.
Why this lesson works in a Korean hagwon
You are teaching teenagers who know exactly what conscription means. The boys have watched older brothers or cousins go. The girls have watched boyfriends or classmates vanish for eighteen months. Nobody needs the concept explained, which means you can skip the warm-up fluff and go straight to the arguments.
The gendered split also forces actual discussion rather than the rehearsed agree-to-disagree you get with "should students wear uniforms." Boys and girls in a Korean high school class do not experience this question the same way, and that asymmetry makes the debate real.
The four tasks
Run this as a sequence, not a free-for-all.
1. Individual write (5 minutes) Put two questions on the board. Students write answers privately, in English, one paragraph each:
- Should Korea lower the conscription age to 18? Why or why not?
- If you will serve: would you rather go at 18 or later? If you won't serve: is it fair that only men go?
Do not let them talk yet. The private writing step matters because the shy ones will otherwise stay silent for forty minutes.
2. Same-gender pairs (10 minutes) Boys pair with boys, girls with girls. They compare what they wrote and prepare two arguments to bring to the larger group. You are buying them a lower-stakes space to figure out what they think before they have to say it in front of the whole class.
3. Mixed-gender groups of four (15 minutes) Two boys, two girls per group if your numbers allow it. Each group's task: agree on the three biggest pros and the three biggest cons of lowering the age to 18, then rank them. They write these on a shared piece of paper in English.
Walk the room. The quiet groups need a prod. Ask: "What did the boys say in step two? What did the girls say?"
4. Whole-class comparison (10 minutes) Each group reads out their top pro and top con. You write them on the board. Then ask: did any group rank the same argument first? Did boys' groups and girls' groups rank different things?
This is where the lesson pays off, because the patterns that show up are the ones they noticed themselves.
The arguments they will actually raise
From three years of running this:
For lowering it to 18:
- Get it over with before university, so you don't lose momentum in your degree or your job
- Physically easier at 18 than at 25
- Everyone does it at the same time, no one falls behind
Against:
- You're not mentally ready at 18
- University exemptions and deferrals become impossible
- It punishes boys whose families need them to work or study first
- Girls still don't go, so the "fairness" argument is hollow
Expect at least one boy to say he would rather go at 18 and at least one to say he wants to delay as long as possible. Expect at least one girl to say the system is unfair and at least one to say she's glad she doesn't have to serve. Let them disagree.
What to do if it goes silent
It won't, usually. But if a group stalls, hand them this:
| Scenario | Question |
|---|---|
| Junho enlists at 18, finishes at 20, starts university | Does he have an advantage or a disadvantage compared to someone who went at 23? |
| Minho gets into Seoul National University, then has to leave for the army | Should he be allowed to defer until after he graduates? |
| Jisoo's older brother served, but she won't | Is that fair? Should Korea have universal service for everyone? |
One of those will unstick them.
Grading this, if you have to
If your hagwon requires you to assess the work: collect the group ranking sheets at the end and check that each student contributed at least two written sentences in task 1. Participation scores, not right-answer scores, because there is no right answer and pretending there is will kill the lesson.
You can run this in 45 minutes if your class starts on time. If you have 60, add a five-minute reflection write at the end: "Did your opinion change after hearing the other arguments?"