WITHOUT YOU

I'm Jung Jaehyun, a time traveler who accidentally left my girlfriend, Park Jihyo, in the past. Now, she's somehow ended up in a futuristic utopian society called NCTmentary, and I need to bring her back before 'they' get her. Can my friends and I navigate the complexities of time and rescue her?
January 12th, 2018. The day I left my girlfriend in the past by mistake. You read that right. You might be thinking, 'what is this guy talking about? the past? impossible!' No, it's true. I can time travel. I figured out my ability to do so when I was just 10 years old.
I've made many friends here for the past 9 years. They don't have powers like mine, but much rather they all have their own unique power. My name is Jung Jaehyun and this is my story.
Today marks one month of my girlfriends disappearance. Perhaps I shouldn't say disappearance but more like the mistake — my mistake — that led to her being stuck in the past.