2D when are you coming back home?

It all started when 2D got a letter from a mail box and it was an emergency so he told the gang that he won't be back for awhile, but it's been 9 months since he was gone. When Noodle was young , she came to 2D's room and knocked on the door to see if he comes back home. But he didn't come back, and Noodle knocked and knocked and knocked till she was about to cry because how much she missed him around without 2D. So she has to wait and she asked Russel a promise that "2D will come back?" So Russel kept it and will never break a promise from Noodle.