BTS (Bangtan Boys), who are celebrating their 300 days since debut, are preparing for their follow-up promotions with "Just One Day" as they take the first stage on 'Show Champion' this week.

They're already getting ready as they diligently practice, and are sharing their practice session with fans as they release fun and cute pictures.�Let their smiling faces in the pictures below brighten up your day as you wait for 'Show Champion' on the 9th.

SEE ALSO: BTS releases 'Just One Day' music video!