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.
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.
Hae Na discovers Seo Won's fear of dogs, complicating her mission to kiss him as a canine. The vice principal's dog scares Seo Won. To protect his phobia, Hae Na secretly helps him. Meanwhile, Yul witnesses Hae Na shapechange into a dog.
Hae-na asks Yul for help to lift her curse by kissing him in her dog form, but it doesn't work. She learns Seo-won must be conscious during the kiss, so she focuses on helping him overcome his fear of dogs.
Hae-na, as a dog, steals evidence of Ji-won's bullying. The bully, Jae-hee, is punished, but she retaliates by falsely accusing Seo-won of sexual harassment.
Yu Na's ex posts Hae Na's secret online. Her former bully Eun Hwan sees it and reports. Hae Na's mom learns of her transformation and wants to know her boyfriend. Hae Na tells Seo Won the truth and asks for help.
Kang Eun Hwan blackmails Hae Na to give him her savings or he'll expose her secret. Her parents find his recordings and photos of her. Seo Won goes to see Eun Hwan after seeing his online posts but gets tied up instead.
Hae Na and Seo Won begin dating in secret after a PDA scandal at a nearby school bans romance. Despite trying to hide it, some notice chemistry between them. Separately, Ji A does a reading for Bo Gyeom and discovers his true identity.
A mountain spirit rescues the fugitive Lady Han from government officers but she despairs when her unborn child dies during the chase. Her servant Mak Soon comforts Lady Han as she grieves.
Hae Na is shocked when her uncle Dong Chul returns to human form without the required kiss to break his curse. Bo Gyeom admits placing the curse and offers to lift it if Hae Na renounces her love for Seo Won.
Seo Won is devastated when Hae Na forgets their love. He attempts rekindling her affections, but struggles. Yet Seo Won learns Ji-A still recalls his and Hae Na's dating history.
Hae Na is repeatedly reminded of her past with Seo Won. A kiss confirms they shared memories. The mountain spirit learns Cho Young's fate and realizes his mistake. He decides to return Hae Na's memories.
After learning the curse's origins, Hae Na and Seo Won find they have feelings for each other. A year later, Seo Won's birthday approaches. Hae Na prepares a meaningful gift for the school festival, but someone unexpected appears.
