My 20th Twenty

So Won, a high schooler, is about to turn 20 in a couple of hours. She meets someone and gets under a curse.

So Won goes to Hanhwa Resort to look for the woman who put her under the curse. And there, she runs into a boy who looks exactly the same as Young Seok. So Won decides to get a job at the resort and has an interview.

So Won joins Hanhwa Resort and starts to live in the dormitory, where she meets roommates of her age.

Deadly drunk, So Won tells Kang Hyun about the witch and even calls him Young Seok. Min Ji also runs into the witch after failing to get promoted. The witch tells Min Ji that she will help her if she buys a pack of gum from her.

Sang Wook starts to show his feelings for So Won and invites her to dinner. So Won tells Min Ji about the witch and the curse. Sang Wook and So Won get closer to each other while talking about the fiction So Won likes, and Kang Hyun gets jealous.

Kang Hyun discovers So Won, who is locked up in the storage, and takes her home, where they kiss.

Nu Ri, Kang Hyun’s ex-girlfriend, visits the resort to see Kang Hyun. Sang Wook and So Won have dinner.

Nu Ri tries to get back together with Kang Hyun. Nu Ri joins the marketing team temporarily for the upcoming event. The witch visits So Won’s roommate and tells her that she will grant her a wish if she purchases a pack of gum.

Sang Wook and So Won talk about love in the comic book store, and So Won tells him about her curse. So Won and Nu Ri fight at the office dinner. Si Yoon tells So Won that he ran into the witch, and So Won goes out to look for her.

So Won finally meets the witch, but the doctor says the witch has Alzheimer’s. Nu Ri wants Kang Hyun back.

The witch says So Won can become 41 once the curse is lifted. So Won and her friends hold a farewell party.

Kang Hyun and Sang Wook are waiting to hear from So Won. Min Ji left the resort and founded her own company.