One fateful day, on his eighteenth birthday, Woo-jin wakes up to see a face and body that is not his own. He is very shocked and confused, he confronts his mother with his new appearance and she is also shocked but tearfully accepts him for who he is. With the help of his mother (Mun Suk) and his best friend (Song-beck), Woo-jin is able to cope with his strange condition. Ever since this day Woo-jin, now a furniture designer, wakes up in a different body every day, regardless of age, gender and nationality. Sometimes he's a man, a woman, old, young, or even a foreigner. He can even speak different languages, depending on who he is for the day. He's the same person on the inside, but on the outside he's always someone new. Looking at a different face in the mirror every morning is hard for him to get used to.
Every morning Woo-jin records himself on his computer, letting himself know who he was that day. And every morning he has to accustom himself to the changes of being a different person. He has to adjust to his new body, eyesight, voice etc. After many years of changing into different people Woo-jin has devised a system where he has all sorts of clothes and shoes to fit any and every type of body type, and of course different types of toiletries depending on if he is male or female. He also has a phoropter in order to test his eye vision and a Brannock foot measuring device to measure his feet and use the right sized shoes.
As a furniture designer Woo-jin is able to work in the privacy of his own home and avoid others from finding out his secret. He is the owner of a furniture company named ALX that specializes on handcraft furniture to meet the needs of each individual person. His best friend Song-beck works with Woo-jin and is the one who takes care of the sales and goes to meet clients in person.
Woo-jin one day develops a crush on a furniture retailer named Yi-soo who works in a furniture store. He begins to visit her everyday to see her and occasionally talk to her but she doesn’t realize this because he comes in as someone else each day. He waits until the right day when he is someone handsome (Park Seo-Joon) to finally approach her and ask her out on a date. He succeeded in asking her out and wanted to continue seeing her as the same person. As a result he went on for a few days without sleep in order to stay as the same person that went out with Yi-soo. Woo-jin inevitably fails to keep the same body due to sleep deprivation and decides to stop contacting Yi-soo because he does not want to reveal his secret to her. However, Yi-soo decides to visit Woo-jin at his home one day and discovers his secret. She is shocked and it takes her some time to comprehend and accept Woo-jin for who he is on the inside.
They remained together and devised a plan to reunite with each other every time Woo-jin transformed. When ever Woo-jin grabs Yi-soo’s hand she’ll know that it’s him. Or at least that was the idea. Yi-soo, after some time starts having difficulty with their relationship. She never truly knows who Woo-jin is and has to fully trust that the stranger grabbing her hand is Woo-jin. People begin to gossip about Yi-soo, saying that she is always going out with different men. This pushes her to a breaking point where she relies on medication to be able to cope with her stress, anxiety, and insomnia. In order to help her, Woo-jin decides to disappear from her life. Time goes by but Yi-soo never stopped loving Woo-jin and is determined to find him.
Yi-soo is able to find Woo-jin once again in a different country (the Czech Republic). She confesses to him that she still loves him and wants to spend her life with him. After this confession Woo-jin proposes to Yi-soo and she accepts.
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