An bayyana shi a matsayin mai jin kunya, ɗalibi mai kyau wanda ya yi daidai da abokansa kuma ya kasance mai sha'awar kwallon kwando. Wani ɗalibi ya yi masa jagora, wanda aka ɗauka cewa shi ne mai tsaron lafiyarsa. Koyaya, daga baya an ba da shawarar cewa ɗalibin a Gümligen ba Kim Jong-un ba ne, amma ɗan'uwansa Kim Jong-chul. Daga baya, an ba da rahoton cewa Kim Jong-un ya halarci makarantar jihar Liebefeld Steinhölzli kusa da Bernniz a ƙarƙashin sunan "Pak-un" ko "Un-pak" daga 1998 har zuwa 2000 a matsayin ɗan ma'aikacin ofishin jakadancin Koriya ta Arewa a Bern. Hukumomin Koriya ta Arewa sun tabbatar da cewa wani ɗalibi mai jin kunya daga Koriya ta Arewa ya halarci makarantar da ke da kyau tare da abokansa kuma yana da sha'awar kwallon kwando tun farkon aji na 6 a Jami'ar Kobe Bryant a watan Afrilu na shekarar 2000. An kuma bayyana shi a matsayin wani ɗan wasan kwallon kwando wanda ya yi fice a matsayin ɗan takara na farko da ya halarci makarantar, amma ya nuna rashin amincewa da shi a matsayin ɗan tak
mai jin kunya