Six member idol group B2ST thanked their fans in celebration of their 400th day since their debut. The group debuted in October 2009 with the album "Beast is the B2ST", and went on to release their singles, "Mystery," "Shock," and "Breath". They've recently returned to the industry with their fourth mini-album, which features the tracks, "Lights Go on Again" and "Beautiful." Fans left congratulatory messages on Twitter saying, "B2ST congratulations on 400 days," "After debuting on October 16th, 2009, a year has already passed, and now it's already 400 days," "Please be with us 'beauties' until you die," and "B2ST Forever!" Member Lee Ki Kwang tweeted in response, "Whoa 400 days... Has time already passed this much. Please support us in the future." Yoon Doo Joon also posted, "400 days! Time is so fast... The days are getting colder so let's stick together," while Yang Yoseob stated, "We started the day early so this day will be long again, but thinking that we've spent the past 400 days fully, I'm not tired at all! Thank you and thank you! Please stay with us in the future as well, okay?" In further news, B2ST will be debuting in Japan on the 27th of November. Source + Photo: Nate