@Hualian78 because in Korean, they would address their partners as "oppa" (aka older brother) as a term of endearment other then calling them by their names or petname, hope this helps!
Comment by Zuri on Hualian78
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@Zuri Ah, so the translation is wrong. If she called him “oppa” then it makes sense. Because here she told him “my brother’ which meant it should have cleared the misunderstanding.