Season 1

While walking down the street with a friend, Dami accidentally swallows Woo-yeo's fox bead. The next day, Dami moves in with Woo-yeo, hoping to find a way to return the fox bead to him.

Dami is shocked knowing that she could die if she fails to get the fox bead out of her body within a year, and Woo-yeo writes a contract to protect Dami and the bead. Dami struggles to survive in college among Tiger men.

Woo-yeo discovers a strange reaction of his bead to the woman where it’s currently settling. He also finds himself connecting to her emotionally, as Lee Dam empathizes with him as well.

Woo-yeo starts to get annoyed by Seon-u texting Dami, and Hye-seon tries to become a college student using Woo-yeo's magic, promising Woo-yeo that she will watch over Dami.

Dam feels love for Woo-yeo, and Woo-yeo, who was trying to keep his distance, also begins to feel special feelings for Dam. Woo-yeo is suspicious of a murder case in the downtown area that has become a issue.

Dam is disturbed by the thought that Woo-yeo doesn't understand her feelings. Dam goes on a blind date with a disturbed heart, and Dam's mother visits the house where Woo-yeo is left alone.

Just when Woo-yeo decided to let go of Dam, an unexpected person appears to be after Dam, he decides to keep her next to him for a little longer.

Woo-yeo feels bitter and empty watching Dam lives on without him; Dam recalls something as Seon-woo confesses his love to her.

Dam is bothered that she kept on running into the professor Woo-yeo yet is curious to find out the relationship with him and Hye-sun.

As Woo-yeo begins to feel hungry, Hye-sun tells him that keeping himself from physical touch would ease the hunger; Woo-yeo tells Dam to keep a distance to prevent his spirit from losing.

Woo-yeo feels bitter about the thread of fate that Dam and Sun-woo share but pretends to look calm; Hye-sun gets in the way of someone unexpected.

Woo-yeo dreams of going on a date with Dam just like every other human but soon he is self-conscious about his real self.

While Dam is indecisive about the breakup with Woo-yeo, she hears from Hye-sun that Woo-yeo's bead has turned blue.

Dam searches for a way for Woo-yeo to become a human and moves in together. Woo-yeo finds it difficult to share his every minute with Dam.

Dam can't seem to get off her mind from what happened last night and feels the need for a new label with Woo-yeo; as Woo-yeo's trick fails more often, he assumes that he's becoming a human.

Woo-yeo tells that it's close to an end, and Dam misunderstands it as to Woo-yeo is getting close to being a human.