Unfortunately I don't remebrer much. It was a romance story abaut a girl whose parents had maybe a ryoukan? And she loved drawing and wanted to be an artist but her parents didn't let her do it. And the ml was a prince of a random country and just happened to be in japan, and they met, the ml didn't have money and she paid for him for a ride or food. After that the ml wanted to find her with an advertisement bc he only knew the first letter of her name (maybe K?) And they met again, dated a bit, but had a fight, time slip, and the fl is going to learn art in the ml's country? I think something like that. I readed it only until this part. And I think the girl had long black hair. If I remember it correctly, it was originally japanese but maybe I saw once a colored korean version on tapas?