Dongwoo knew it was coming and he hated it. he doesnt want to see the second invasion concert happening and the reason why is ... 

What does Dongwoo have to do when Sungjong gets jealous?  The maknae is throwing a fit~  Uh-Oh :c

Dongwoo wont stand for it any longer. He couldn't just sit around and watch the person he love go through so much pain. He knew he could take the younger away from it all and he was detemined to do so.

Sungjong left Myungsoo, so that he could be happy. The backlash of it all was leaving Sungjong in pain as the memories continue to replay in his mind. Dongwoo just so happens to be knowing what's doing on.