Um Bom Dia para Ser um Cachorro

Hae-na has a crush on one of the male teachers at her school. After a few drinks at a get-together with the teachers, she discloses her feelings to him. However, after she kisses him, she realizes it's Seo-won, the man she can never get close to.

Hae-na begs Seo-won for another chance to go on a date with Bo-gyeom and him as a group to lift the curse. Therefore, Hae-na, Seo-won, Bo-gyeom, and Chae-a end up going on a double date to play a room escape game. Seo-won tries to leave for the day, but Hae-na has to stall time until midnight.

Hae-na finds out that Seo-won is afraid of dogs. It complicates things as she has to get a kiss from him while she’s changed to a dog. The vice principal brings his dog to work, making Seo-won panic. Hae-na secretly helps Seo-won so that no one finds out about his secret fear of dogs. Meanwhile, Yul witnesses Hae-na transforming into a dog.

Hae-na decides to ask Yul’s help and let her into his place while Seo-won is asleep. She kisses him while she’s in her dog form, but the curse doesn’t get lifted. Later, Hae-na finds out that Seo-won has to be conscious when she kisses him for her curse to be lifted. To do that, she decides to help Seo-won overcome his fear of dogs first.

Seo-won witnesses Ji-won getting bullied by her friends. To secure the evidence of bullying, Hae-na steals the bully’s phone while she’s transformed into a dog. An anti-bullying committee meeting is held to punish the bully, Jae-hee. To take revenge, Jae-hee decides to falsely accuse Seo-won of sexually harassing her.

A new student, Ji-a, transfers to Garam High School, and she turns out to be a shaman. She notices a different energy around Hae-na and Bo-gyeom. Hae-na fails to kiss Seo-won, so she has to seek her chance during the school trip. Meanwhile, some of the students sneak out at night, so Hae-na ends up going outside to look for them, risking herself to be exposed.

Yu-na’s ex-boyfriend posts Hae-na’s secret online. Eun-hwan, who used to bully Seo-won in high school, sees the post and covers the story. Hae-na’s mom finds out about her transformation and demands to know who Hae-na’s boyfriend is. Hae-na decides to tell the truth to Seo-won and ask for his help.

Kang Eun-hwan blackmails Hae-na, saying he’d expose her secret unless she gives him all her savings. Upon hearing what Eun-hwan did, Hae-na's parents invade his place and find the recordings and photos he took of Hae-na. After seeing what Kang Eun-hwan posted online, Seo-won goes to see him, but he gets tied up instead.