I found it similar with Goong because both of the series have resemblances within the story--She fell first but he fell harder. Both of the series also have a cold male lead and clumsy--warm female lead.

Other than that, I found resemblances between Yoon Eunhye and Mone Kamishiraishi. Aren't they looks similar? Their expressions, also some of their facial features similarities made them look alike compared to each other.