I have always had a keen interest in interior design. While working a regular job, I ended up starting a space rental (party room) business as a side hustle. Thanks to word-of-mouth about the well-decorated space, I was earning a decent side income. Then, the COVID-19 era suddenly arrived. As digital transformation and contactless consumption accelerated due to the pandemic, countless offline spaces went out of business. The space I operated was no exception. To revive an offline space with declining foot traffic, I needed something different from what I had done before. It was while I was going through many trials and errors to find that something that I discovered this book.