Chou Tzuyu, a 23-year-old professional photographer sees the past and future through her camera lenses. It was just three years ago when it started. She was on a photoshoot with EXO's Baekhyun and she saw a glimpse of his past. Since then, he became her friend - more like a confidant. He knows how much she cries when she sees other people's past or her panic if they're to face an accident in the future. Not even her housemate Jennie knows this. How much does he really know?

On the contrary of having known of other people's past and future, Tzuyu doesn't know parts of her life. Why is she living with Jennie, what has her life been when she first set foot in Korea - everything that happened in Korea before being able to see the past and future through her camera lenses. That part of her life...remains to be a mystery to herself.