I think the trailer was for a new drama that was set in a video game;  about two high school kids.  The most popular boy in the high school was a high level character in the video game.  I think he had a crush on the girl video gamer in the game, but in real life he did not know who she was at school.  She knew who he was though. I saw the trailer once, I don't know if it was for a real show or not. If you have seen this trailer before could you please respond with the name of the show. 

This sounds pretty much like Love O2O. The main characters are university students though.
Thanks, I think this is it.