Actor Lee Seowon was featured in the recent interview and photoshoot of @style 2017 January issue.
When he was asked "Were there any idol group that gave you a special impression?", he answered "I was amazed after watching BTS's stage. The stage was very slippery and unfavorable during the event at Gyeongju. But I realized they were real professionals when they performed perfectly in sync group choreography on such unfavorable condition.".
Original article here