Eunsoo Min is an all-star overachiever: She's smart, beautiful, she went to the best schools, and everything she does in her professional life is a success. Her life is going great - and the last thing wants to do is get married. So when her boyfriend proposes, she dumps him on the spot. Still, anyone would be depressed after a breakup. She goes drinking with her team from work, gets plastered, and winds up in bed with Hyunjae Do-the team newbie! She decides to forget all about it, and life goes back to normal. Except for one thing - morning sickness! Will she let Hyunjae raise the baby with her like he wants to? Or will she stay true to her anti-marriage stance?