¤ her unusual habits are when she is thinking about something, instead of frowning, she would stare blankly to her side. and when her blood is boiled, she would usually crack her neck while maintaining her straight face

¤ this girl doesn't know anything of love. she has never dated, or even just fall for someone before. she doesn't like romance things as well. she doesn't usually watch dramas or movies, but when she does, she would usually watch the ones that contain mystery, thriller, or crime

¤ serin was naturally a left-handed, but her grandparents accustomed her to use her right hand, so she used to use her left hand for writing and drawing (she actually can't draw, but you know, she will have no choice but to do it if she get an art assignment). as time goes by, she becomes an ambidexter

¤ as you can see from her nicknames, she is a good fighter. she learnt wushu for 5 years and taekwondo for 2 years. it sounds like a short period, but for your own sake, you can't look down to her even that she will be pleased if you do. because serin will think of it as her advantage if she is going to against you, in any means

¤ despite of being known as beomjo's friendly cotton candy, she actually can't really smile properly. she tends to smirk instead of smiling. pulling the corner of either her left or right lips slightly. and strangely enough, it does look like a smile. a sweet friendly smile. she herself doesn't know why can't she smile properly, but it seems like she habitually smile like that which made her can't do a proper smile

¤ her father is both a ceo and a heir of a conglomerate multinational company called 'BNG Group'. it comprises numerous subsidiaries such as BNG Electronics, BNG automobile, and BNG Life Insurance. while her mother is currently a chairman of Reluire Group, which is a fashion and cosmetic company that has their own department store in some country including south korea, japan, china, and hongkong

¤ she sits on the back left corner of her classroom, and she tends to read book during break time when she doesn't feel like wanting to eat / drink something (she tends to eat or drink when she wants to, not when her body needs to). it's mostly a mystery / crime genre, but when she feels mad or just simply in a bad mood. she can't really express her anger to someone, so if it's piled, she would usually go to the rooftop and listen to a music to calm herself

¤ serin has always wanted to have a younger brother, but it somehow became a difficult thing as her parents are both busy to handle their own company. that's why she always treats a boy nicely. especially those who are visually younger than her. she literally treats them as if she is their own older sister. but the thing is that her actions are too sweet to be compared to any other older sister's, which sometimes leads into a misunderstanding

¤ despite of being a heiress of one of the two big companies her parents own, that fact is unknown to the students. even probably the teachers don't know about it. well, not all of them don't know about them, because some of the school residents know it. they are her sister, aerin, the senior she is close with, yongwon, one of the teacher who actually has a family relation to her even though it's a far one, and some students whose have a parent or two who works for her parents' company.

¤ no one in the school except her sister and a senior called lee yongwon knows her birthday. that's why she doesn't address anyone as unnie nor oppa beside those two. (she addresses her seniors as senior / sunbaenim). she calls her fellow graders by their names even though she knows that she is probably younger than most of them, that's why she also can't adress anyone who was born around '99 and '00 as oppa / unnie even outside the school too, unless they are a senior of her in terms of grade

¤ serin has a hidden room inside her own room. the entrance is hidden inside her fitted wardrobe. door inside a door, something like that. the secret room's door is hidden behind a built in wardrobe. of course that won't be there just like that. but one thing that is certain, is that her mother probably had been observing her when serin was still in taiwan. and it also seems like her mother found out about the fact that serin won't talk about anything, won't hear about anything, as well as meeting anyone when she is down. so probably she gave serin that hidden room linked to her bedroom because of that reason

¤ serin and her sister were raised by their grandparents (from father's side) because of her grandfather's (from her mother's side) sudden death which made their mother have to take over his company as the sole heiress. it made her mother became too busy to raise 2 children at once. at first her mother used a babysitter, but after her grandparents from her father's side found out about it, they suggested her mother to hand serin and her sister to them. but they moved to beomjo a year ago because their parents thought that they are big enough to take care of themselves, so it would be fine even if they don't see their parents often