The B2ST boys said their goodbyes on the October 30th episode of Music Core. It has been a pretty short promotion period with "Soom", as the B2ST boys will now start to prepare for their upcoming debut in Japan and solo concerts in Korea at the end of the year. But rest easy, as B2ST will also return in mid-November for follow-up promotions! Check out their heart-stopping "Soom" performance below.