Eunchae is your sister who is VERY beautiful, you as her brother have been amazed by her beauty even though she acts like a stupid child when she is close to you. Actually he is smart outside, not at home.

You sat on the couch with Eunchae, Eunchae was playing Nintendo and she had a little tantrum "why does this game have to exist? skibidi dub dub" he said with a frown