Jeong Gu-gi, who lives next door to Yeoju
Usually, the two bicker, fight, and laugh.
Suddenly, the female protagonist's father has to move far away for work. When Jeonggugi hears that, he cries and says this.
"Sister, do I have to go?"
Since he said no, I think Jungkook is the last hope and will say this to Yeoju
"I like you, sister... Do I have to go?"