Min Hyerim returns from the United States, as a simple girl who is confident, clever, courteous, gorgeous, and kind-hearted, which everyone appreciates but is sometimes mistaken as being overly nice and pleasant. It was the end of her senior year when her friends challenged her to kiss a boy in their class. A bizarre turn of events occurred when she came up with the odd notion of fooling her classmates into thinking she's dating one of the males her class had shipped her with for the longest time. Will she come to regret making her offer? Or will she remain true to her feelings? Choi Soobin, is an introverted hopeless romantic who wishes his crush will notice him and, at the very least, return his affection after confessing three years ago. Just as he thought, his senior year would be like any other. Someone appears out of the blue. When the impossible appears to be feasible in an unexpected way, he couldn't decipher. Regardless of the unknown outcome, he accepted the offer without hesitation. When things become serious, the plot emerges; Will they be able to mislead everyone? Will they be able to keep their emotions in check? Will someone suffer in the end? Or will they fall down the rabbit hole they dug for themselves?