Ilana Tan is an Indonesian novelist renowned for her series of four romance novels, each set against a distinct backdrop in major cities around the world. Her novels are interconnected, with characters from one novel appearing in others, creating a unique universe.

Her debut novel, Summer in Seoul, is set in Seoul, South Korea. She followed this with Autumn in Paris, Winter in Tokyo, and Spring in London. Each novel takes place in a different season—summer, autumn, winter, and spring respectively—in these vibrant cities, enriching the romantic narratives with their unique cultural and climatic settings.