I think that this is from orange caramel magic girl :)
i think "ottoke?" is appropriate. (pronounced as: oh-tok-keh?)
Irol ttaereul bomyon na origineun hangabwa nun ape dugodo ojji hal jul molla Ottoke deul sarangeul sijakhago inneunji saranghaneun saramdeul marhaejwoyo Onjenga geunyo soneul jaba bol na olkkayo Gameun du nun wie kiss haneun naldo wajulkkayo Hello Hello nareumdaero yonggil naessoyo Hello Hello jamshi yaegi hallaeyo Hello Hello naega jom sotuljin mollado Who knows ojjom uri jal dweljido molla Naega dagasoya haneunji jom do gidaryoya haneunji Modu dareun mareul haneun ge do oryowo Mideul su opjyo bogi boda nuni nopayo Ironil nan heunchi anaya nae mal midojwoyo Amurochi anke genyol aneul nal olkkayo Saenggakhan daero modu irwojindan mal midoyo Hello Hello nareumdaero yonggil naessoyo Hello Hello jamshi yaegi hallaeyo Hello Hello naega jom sotuljin mollado Who knows ojjom uri Choeumeun anijyo sashil malha jamyon sarangdo ibyoldo haebwatjyo Hajiman oryowoyo imareul midojwoyo Geudaeneun dallayo Hello Hello iboneun nareul da golgeyo Hello Hello Baby Baby Baby girl Hello Hello jigeumeun ottolji mollado Who Knows ojjom urine Hello Hello (Hello nae gyoteul maemdon geu shigandeul gesok) Uhyeah Hello Hello (Geu otton gippeumgwado bigyo mothae No More geudael ijen pyohyon hal su opgo) Hello Hello (Nae soneul jamneundamyon Never let you go) Jigeumun ottolji mollado (Ironge sarangimyon joldae an nochyo) Who knows uri duri Unmyong ilji molla Hello Hello