For 3 years, Dahyun held an unforgettable grudge towards her ex for leaving her without a valid reason and explanation, overthinking on what she had done wrong to be left without a word from her supposedly girlfriend. After 2 years of working at her best friend's coffee shop, Dahyun decided to apply for a job in order to finally live independently. However, an unexpected turn of events happened, causing her to remember every memories and pain, when she realized that she had applied for a company in which her ex is, unfortunately, the CEO of the said company.