A Good Day to be a Dog

A Good Day to be a Dog is a drama and romance webtoon by Lee Hey. It's about a woman named Hana, with a family curse of turning into a dog every midnight after her first kiss. The only way to break the curse is to get a second kiss from the same person as a dog. The original webtoon is in Korean.

Synopsis
Hana is cursed into a dog from her first kiss, and the only way for her to break from the curse is to get the second kiss from her first kiss.