It was my first ever drama i have watched in South Korea's drama list. It made me fall in lovee with this drama. And started watching so many on.. Ko Moon-Young is a best-selling children's author with a fiery personality. She met Moon Gang-Tae at one of her reading events at the mental hospital. An unruly patient, and when Moon-Young was about to stab the patient, she stabbed Gang-Tae.

They had several more encounters, and Moon-Young made it clear that she liked Gang-Tae. Gang-Tae is a busy man; He works in a mental hospital and takes care of his older brother, Sang-Tae, who has an autism spectrum disorder. Sang-Tae is a big fan of Moon-Young's fairy tales and is very happy that he has the chance to meet her in person. However, he caused trouble and Moon-Young, knowing it was Gang-Tae's brother, intervened. She was caught cursing at her parents who hurt Sang-Tae, and after the incident was posted on the internet, she was punched and her upcoming book was compromised.

Since Gang-Tae lost his job at the mental hospital after the incident with Moon-Young, he decided to work at the OK Psychiatric Hospital, located in Gangwon-do Province, where they were born. Gang-Tae and Sang-Tae return to Gangwon-do and stay with Ju-Ri, an old friend who has a crush on Gang-Tae. This province is where their mother was killed, and the fact that their mother was killed is the reason they keep moving because they fear the butterfly will follow them. The butterfly is the brooch Sang-Tae sees on the woman who killed their mother; because he was always afraid of butterflies. He was traumatized by this incident and could not clearly recount what happened that night, he was with their mother when she was murdered, but he was distracted by a child. cat. When the police asked him what happened, his only answer was that his mother was killed by the butterfly.

Because Moon-Young was criticized for swearing, she returned to Gangwon-do, where her parents' mansion was. She returns to their creepy mansion and teaches literature classes at OK Psychiatric Hospital, as her main intention upon returning is to be with Gang-Tae.

Moon-Young hires Sang-Tae as an illustrator for her next book and makes her sign a contract, Sang-Tae and Gang-Tae move in with her in the mansion. The three stick together and argue most of the time.

Moon-Young's father is hospitalized with dementia and a brain tumor. As he dies, he recounts what happened - he tries to beg forgiveness for killing his own wife, Moon-Young's mother. She falls down the stairs when he pushes her, when he is provoked when she seems so relaxed and happy after killing their housekeeper, or Moon-Young and Sang-Tae's mother. He also denies trying to kill Moon-Young, as he was simply trying to keep him from becoming a monster, like his mother.

Sang-Tae is trying to overcome his fear of butterflies. He slowly recovered with the help of Dr. O, the hospital's director. He could tell what really happened - he chased a cat, and when he returned, a woman slit their mother's throat. The woman then turned to him and threatened him. He clearly remembers the butterfly brooch, and Sang-Tae realizes he's seen the clip in Moon-Young's mother's photo. He cried when he realized that it was Moon-Young's mother who killed their mother.

Gang-Tae has distance from Moon-Young, but he eventually realizes that Moon-Young is different from his mother and should not be blamed for his sins. He tried to forget this fact and also hid it from Moon-Young and Sang-Tae. However, one day, they discovered that someone had drawn