Big Star showed the other side of idol life by sharing photos after their "Run & Run" practice!

The group shared a set of photos from the practice room and tweeted, "It is 3 AM right now... Big Star are still running!! Even if we pass out, we will gain strength from our Only One's love and will return the love with an even better stage! Today! Let's run together on 'Music Bank'!!"

Check out the result of all their hard work for their 'Music Bank' performance here.

SEE ALSO: Big Star gets you running with excitement with 'Run & Run' MV