Fans of BOYNEXTDOOR, also known as ONEDOOR, were surprised to see an unexpected celebrity turn up at the group's first pop-up store at The Hyundai Seoul: HYBE Labels chairman Bang Si Hyuk! 

The HYBE Labels chairman and music producer was spotted at the pop-up store on April 19 KST, taking on guided tour of the pop-up space, snapping photos and filming videos of the various goods and displays. In particular, the chairman brought fans laughter by giving off "proud dad" vibes.

According to fans, Bang Si Hyuk is known for popping up at many of these events for HYBE Labels artists, enjoying the experiences just like fans.

Meanwhile, BOYNEXTDOOR's comeback pop-up store, 'BOYNEXTDOOR Ground in The Hyundai Seoul', will be open from now until April 28. 

SEE ALSO: Bang Si Hyuk’s LA mansion escapes wildfire, Beyoncé among evacuated neighbors