I know a romance novel about Puppet Masters and shadows. It's called " The Puppet Masters 'Fate ". The male protagonist is a Puppet Master, and the female protagonist is a mysterious shadow. The two of them slowly got to know each other and grew up. Later, the male lead made an exclusive puppet for the female lead. This novel was easy and interesting, with a touching plot. It was definitely a good choice for romance novel lovers. I hope you like my recommendation.