It was Kim Joon's alumni friends from Boys Over Flowers, showing how deep of a friendship they have even though the drama has already ended for quite some time.

Lee Minho, Kim Bum and Goo Hye Sun were in attendance on the 21st to watch Kim Joon's musical,Youthful March which was having it's last show.  Kim Joon had been acting in the musical for the past three months since July and his BOF friends specially made a trip down to watch him in action despite their relatively busy individual schedules, although Kim Hyun Joong was simply too busy. Kim Joon was shocked when he realized that they were here because they didn't notify him in the first place. Together with a full-house audience, the trio watched the entire two hour performance before, going backstage to show their support for Kim Joon.