进入一张照片，主宰一段他人的时间，可却必须坚守原则：“不论过去，不问将来”。 刚刚开始在bilibili独家放送的国创动漫剧集《时光代理人》，正是这样一部关于转换时空和命运的故事。白鲨JAWS乐队为这部异能题材的作品量身打造了片头曲《Dive Back In Time ...

Please explain this sentence: This project has been in the back of my head for some time. Back of his head? My comments: Simple. The speaker has been wanting to do the project for some time but ...