(Solar: 16, Nayoung/Sowon: 12)

"Unnie, Nayoung is playing your phone!" Yongsun narrows her eyes at the statement and turns to face the direction of the voice.

"Unnie! Sojung didn't call me unnie!" another whine comes. Yongsun groans. She stands up from the floor in the living room and walks into the bedroom, and as expected, she sees the older twin on her mobile phone.

"I put it here to charge, not to let you play with it!" Yongsun bends down and swiftly snatches the phone away from Nayoung's hand as she reprimands.

Nayoung folds her arms and pouts, before turning away in irritation.

"Aish," Yongsun reaches for the plug and unplugs the cable, before bringing it out with her. "I'm going to charge this outside, you're not going to play with it," she declares.

The youngest of the sisters sits on the floor and watches the scene with a plain face.

"Don't you girls have homework to do?" Yongsun whips her head back and stops in her tracks, furrowing her eyebrows as she asks the question.

Nayoung turns to her twin sister. "Do we?"

Sojung turns to face Nayoung as well. "Do we?"

Yongsun sighs. "You two are four years younger than me, but you act like you're four," she laments and walks away, "Well I'm not going to bother about this anymore and you'll just have to face umma-"

"I think we have a math worksheet!" Sojung stands up and swiftly makes a run for her bagpack.

"Math! My favourite!" the older t