JB is a socially awkward student that cannot take no for an answer. When the woman he loves, Kim Jiyeon, rejects him, he jumps off the school building, hoping to end his pain and embarrassment right there, but little did he know he would end up traveling to a futuristic parallel world where everything seems the same, but different at the same time. He must learn to survive in this new world in order to get back to his own world, because in this world, there is a dangerous agency just dying to use his unique world travelling powers for their own selfish needs.