The CEO's Love Miscalculation

One day, Maho is suddenly assigned to be the CEO's secretary. Kaito, the young and talented CEO, is none other than her first love! A few days after becoming his secretary, Maho gets so drunk that she loses her memory of the night they spent together. In the morning, he tells, "Starting today, you and I will have that sort of relationship." Does this mean... she is his mistress? Kaito is rumored to be a cold man, but his passionate hugs, sweet whispers, and mind-numbing embrace make it seem like he genuinely loves her. Though she knows she's just his mistress, Maho's body and soul melt in his hands... Then, when she attends a party at an embassy as his plus-one, she's suddenly hit on by the blond-haired, blue-eyed handsome Evans! Source: MangaPlaza