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Mŏngch'ŏnghan ai, ttokttokhan ai : 21-segi hyŏng nŭngnyŏk in'gan ŭro k'iunŭn saeroun yuga, kyoyuk
- "Mŏngch'ŏnghan ai, ttokttokhan ai : 21-segi hyŏng nŭngnyŏk in'gan ŭro k'iunŭn saeroun yuga, kyoyuk"
- "멍청한아이, 똑똑한아이 : 21-세기형능력인간으로키우는새로운育兒, 教育"