Hi, so this is the backstory to my fic "Text Messages". Since the fic is totally in text-message format, it obviously needs a little explaining. 

Alright, so these kids attend secondary school, not highschool, though technically there is little difference between the two systems. Here's how old and what class everybody is in 2011, but I've highlighted the more important characters (the main character is in orange):

Form 5 (17 years old)

5-A: Byun Baekhyun, Do Kyungsoo, Lee Jieun

5-B: Bang Minah, Lee Taemin, Park Sunyoung (Luna)

5-C: Kim Jongdae, Park Chanyeol 

Form 4 (16 years old)

4-A: Jung Daeun, Oh Sehun, Kangjun

4-B: Byun Junhee, Kim Namjoo, Kim Jongin, Krystal Jung, Choi Sulli

And now for the trivia:

- Junhee is Baekhyun's sister, while Jongin is Jongdae's brother. 

- Junhee and Baekhyun have a poor family background, and have taken up jobs at Chanyeol's father's bakery since young though it's technically illegal (how they met Chanyeol).

- Jongdae's mother is a regular customer of that same bakery (how they met Jongdae).

- There's also this thing called the Troll Code (which I'm not sure if I mentioned in the fic), which is basically something Baekhyun, Chanyeol, Jongdae and Junhee made up since they were so good at pulling pranks on other people (in Junhee's case, the other three trolls). 

- In secondary school, Junhee became close to Sehun, Daeun and Namjoo and they stayed in the same class for three years. 

- Sehun is also poor, and has worked at the bakery since young too.

- Minah and Chanyeol used to date (how they met Minah, and not sure if you really care but spoiler: also how they met Kyungsoo).

- Prior to the beginning of this fanfic, Jongin was attending boarding school and had transfered to the school in the middle of the school year before.

- Sehun and Daeun have been best friends since they were 5.

- Krystal and Sulli dislike Junhee because she is close to the Troll Code (who are popular in school) and Jongin (who is quite popular in school), and also Daeun because she's close to Sehun (who is very popular in school), but Junhee is too tough for them to handle, so they back off. That doesn't stop Junhee from cussing them out though..