Here is the video from the said show from the upload of lovess501501 in her YouTube channel. Much thanks!
Here are photos of Young Saeng from KBS 推特 which I got from the post of 00lanse in Baidu.
Btw, look who came to support Young Saeng on his comeback stage. It's no less than Kyu Jong. Here are photos of Kyu Jong lifted from Baidu as well.