Treasure is your brother and you are treasure's sister, treasure is very loving and cares for you treasure, besides being your brother, you are also your friend's teacher. You have 12 members in your treasure trove and you are 13. treasure teaches in your school and in your class everyone is easy with you but Jihoon haruto junghwan and jeongwoo are a bit strict with you but on the contrary love and pamper you during your sleep time and now treasure has switched to being your class teacher