A�B.A.P fan�has revealed the reason behind leader�Bang Yong Guk's unpleasant facial expressions during a performance of "Crash".

An explanation was written on B.A.P.'s official fan cafe on the 8th.�The fan explained that Zelo, who is 183cm (6ft) tall and weighs in at 63kg (~139 lbs), jumps up and lands on top of Bang Yong Guk, and because of this, Bang Yong Guk would have felt Zelo's weight to be around 116 kg (~256 lbs).

The fan continued,�"That's why Yong Guk oppa couldn't smile during the performance. I understand why. It's not that he didn't smile, it's that he couldn't. I didn't realize I could use what I learned in physics class in this way," causing laughter among fellow fans.

Netizens and other fans commented, "The pain that Yong Guk oppa couldn't express. Haha," and "Bang Yong Guk's bones almost broke because of Zelo."