A heartfelt proposal might be the end of Kang Hoon and Yoon Seo's relationship. But is a different kind of contract an offer Yoon Seo can't refuse?

Kang Hoon's mother isn't happy about his feelings for Yoon Seo. Just when the couple seems the closest, a new contract proposal could ruin everything.

Kang Hoon and Kang Joon have a bad case of sibling rivalry. Yoon Seo has an idea to wash away the anger, until an unexpected visitor stops them cold.

Old sibling rivalries cause even more tension between Kang Hoon and Kang Joon. A dog bite and a mysterious photograhp make Yoon Seo begin to wonder.

Business is booming at the clinic, leaving Yoon Seo no time for Kang Hoon. A real kiss and a visit from Kang Hoon's younger brother complicate things.

After Yoon Seo moves in, Kang Hoon tries to adjust to the close quarters -- and her cat. They draw up a house agreement, but that causes more tension.

With no place to live, Yoon Seo moves into Kang Hoon's house. Being a wealthy guy's fake girlfriend has its perks, especially when lightning strikes.

Yoon Seo gets drunk with Sang Hyun after treating an elderly dog. Kang Hoon is furious, and the following day, Yoon Seo misinterprets what happened.

Yoon Seo and Kang Hoon are photographed kissing at the party, causing a press frenzy. Sang Hyun and Kang Hoon argue when Yoon Seo twists her ankle.

Kang Hoon invites fake girlfriend Yoon Seo to an important party. He is stunned by how beautiful she looks, but the party takes unexpected turns.

Ra Mi goes to Yoon Seo's clinic, where they're openly hostile to each other. On their first fake date, Kang Hoon pretends he's annoyed by Yoon Seo.

Yoon Seo and Kang Hoon finally sign the relationship contract, but the first day doesn't go as smoothly as they'd hoped.

Yoon Seo's friends give conflicting advice, while Ka Pang tries to get Kang Hoon to finish his pet food commercial. A new contract is in the works.

Kang Hoon helps Yoon Seo show up her mean friends, then suggests a new contract to help them both. Yoon Seo and Sang Hyun have a first date.

Yoon Seo opens her new practice. Kang Hoon gets motherly orders on dating. Two very different lunches are turning points for Kang Hoon and Yoon Seo.

When an old rival gets under Yoon Seo's skin, she makes a rash decision about the clinic. A new business arrangement with Kang Hoon is on the table.

Kang Hoon's attraction to Yoon Seo hits another hurdle when he sees her feistier side and misinterprets her bill for treating him at the clinic.

Kang Hoon wakes up in Yoon Seo's clinic. After calling PA Kang to pick him up, he leaves the sleeping Yoon Seo his card, but her cat has other ideas.

After Kang Hoon fights his way out of a kidnapping, Yoon Seo finds him and reluctantly treats him at her clinic when he won't go to the hospital.

Timed veterinarian Yoon Seo's life is centered on her animal clinic. Then she has a chance encounter with CEO Kang Hoon, who's her polar opposite.