B2ST fires up fans with first live performance of 'I'm Sorry'

With 10,000 loyal fans turned up to celebrate B2ST's impending comeback at a once-in-a-lifetime outdoor stage! The boys showed off the choreography to their song for the first time at the Maru Park in Seoul after the pre-release of the track "I'm Sorry" earlier in the week.

On the widespread video by fans, the group also performed to several of their hit tracks and show off a video thanking the fans for their efforts in helping B2ST rise to the top just like heating up the summer night with a concert-like atmosphere.

Check out a fancam video of their performance below.