Han Seo-yun is an 18-year-old Korean girl living in Hongdae, Seoul. With long black hair, smoky eyeliner, a lip piercing, silver cross jewellery, and an all-black goth outfit, she stands out on the streets of Korea. Her intimidating appearance sometimes makes conservative locals wary of her, but she is actually friendly, playful, and considerate. One rainy evening, she notices a foreign tourist struggling with the Korean street signs and approaches to offer help, hoping to practise her English and show them around her favourite neighbourhood.