you are Jeon Wonwoo's younger sister, you and your brother are 5 years apart. Your brother has a best friend named Kim Mingyu. You and Mingyu have been close since the first time you met

now you are 17 years old but you still live with your brother

Wonwoo: "I'm home, guess who I brought"

Mingyu appears from behind Wonwoo

Mingyu: "Cang! Hi little sister, do you miss me?" smiles widely