Was it only casual when you called me baby, took me out on dates and held me close every night? Apparently yes. Years after a brief and disastrous connection back in college, two coworkers find themselves thrown together in a high stakes project. As Yejin and Mingyu confront their unresolved feelings and past mistakes, will they choose to keep it casual once again or is there hope for something more?

|COMPLETED| For as long as she could remember, Kang Haeun's world revolved solely around the Choi family. Her father was Mr. Choi's personal driver while her mother was Mrs. Choi's assistant. Even after her parents (and unfortunately the Choi's) untimely death when she was fifteen, Haeun continued to live at their state and eventually became the personal secretary of Chairman Choi, the patriarch of the family. However, the Choi she cherished the most in her life was the Chairman's grandson, Seungcheol. What started as an innocent crush soon turned into years of one sided love. In Haeun's eyes, Choi Seungcheol could do no wrong. Meanwhile, Seungcheol saw Haeun as nothing but 'the help'. When the Chairman passes away and a surprising clause in his will states that Seungcheol must marry Haeun if he wants to secure his position as the rightful heir of his grandfather's empire, they are left with no other choice but to comply to the old man's last wish. While Haeun sees this unexpected turn of events as her only chance to care for and love Seungcheol like she always dreamed of, her new husband is hell bent on making her regret every single day of their ill fated union. If Seungcheol had paid a little more attention, he would've realized that, in the end, the only one left with any regrets would be him.