Taeyeon, yoona, Onew and I. We're all friends since childhood my actual sister is yoona, and Onew and Taeyeon are brother and sister but both of our parents died in a tragic boat accident and we've been taking care of each other. How we've been surviving you're asking is working for taeyeons uncle small shop but we mostly make our money by racing illegally at night, since we still have to go to school in the morning. But we try to keep our identity a secret. One day Taeyeon's aunt called her she needs help running her mechanic shop back at her suburban place and we're all heading down there to help. 
 

Now we have to work at a mechanic shop, go to school and race at night in secret from auntie. That's not a combination to call for trouble. Maybe school won't be boring? I guess we'll have to find out.