《A Good Day To Be A Dog》Adapted from the online comic of the same name (original title: 오늘도사랑스럽개), the plot tells the story of the heroine, high school teacher Haina, who accidentally kissed her colleague Chen Shuyuan after being drunk one day, starting a familyThe curse caused her to turn into a puppy in the early morning, and the way to change back was to kiss the male protagonist Chen Shuyuan again, but she didn't expect that he was not only boring and shy, but also super afraid of dogs!So Haina had no choice but to work hard to get closer to him...

Park Kyuyoung plays the heroine Han Haena and Chen Shuyuan are teachers in the same high school. Haina has never been in a decent relationship since she was born. Because her ancestor tortured a puppy to death, she was punished by the mountain god and cursed their family for generations.As long as the children and grandchildren kiss the opposite sex, they will turn into dogs every morning.

Cha Eun Woo plays the male protagonist Chen Seo Won, a high school mathematics teacher who is a colleague of Han Hae Na.She is very popular among female students. She is very cautious at heart, considers the feelings of others and is also very gentle, so she is not likely to reject others.Because he was afraid of dogs and afraid that others would laugh at him if they found out, he was bullied when he was in school.

Lee Hyun-woo will play Lee Bo-gyeom, a mountain god who hides his sword behind his smile, and he is the mastermind behind the heroine Haina's entire family being cursed with the curse that turns her into a dog if she kisses him!