A wealthy business heir marries an ordinary office worker after they have a one-night stand that leads to her unexpectedly becoming pregnant.
Wealthy CEO Lee Gun plans to propose to his girlfriend soon, but things take a turn when he has a chance encounter with office worker Kim Mi Young.
Mi Young and Gun inadvertently have a romantic encounter when they each unknowingly ingest a powerful drug, causing a variety of problems.
Mi Young goes to confession to say she's pregnant, but the man she talks to isn't a priest. She then goes home to Yeoul Island to tell her mother.
Gun intervenes when Mi Young considers taking drastic action with her pregnancy, and Mi Young's mother insists that they get married.
Gun refuses to share a bed with Mi Young when she moves in with him, and asks her to sign a divorce agreement for after the baby's birth.
Gun agrees to sell the factory on Yeoul Island to an evil company, but he soon regrets his decision. Mi Young is confused about her feelings for Gun.
Daniel wonders if Gun really cares for Mi Young. Mi Young is disappointed about Gun's business plans and considers leaving him.
A woman threatens to blackmail Mi Young with information about how she and Gun ended up together. Mi Young pretends to be Gun's secretary to Se Ra.
With a divorce settlement hanging in the air, Mi Young is walking on egg shells. Meanwhile, Se Ra is trying to get Mi Young away from Gun.
When Mi Young's mother forces Mi Young to leave Gun, Se Ra uses the opportunity to try to get Gun back. Mi Young and Gun secretly plan to meet.
Gun has amnesia, which prevents whim from remembering anything that's happened over the past three months, including being in love with Mi Young.
Gun regains his memory, then decides to break up with both Se Ra and Mi Young. But Se Ra and Mi Young each devise ways to win him back.
Gun and Mi Young have a complicated encounter when he attempts to purchase one of her paintings but doesn't want her to know he's the buyer.
Gun decides to hire Mi Young for his advertisement, but will they be able to get over their past relationship and work together now?
Gun pretends to be OK with Daniel's proposal to Mi Young, but is clearly struggling to cope with it.
Daniel buys shoes for Mi Young. Mi Young hits a wall at work, but Gun gives her inspiration while pretending to be an elderly woman.
Gun reveals to Mi Young that he's her most dedicated fan. Se Ra tells Daniel why Gun pushed Mi Young away. Se Ra tries to make amends with Mi Young.
Gun makes a major decision about his future with the company and publicly reunites with Mi Young even though things aren't quite right.
The big wedding day arrives, but the couple has disappeared. Is everything OK, or has the ceremony been called off?
A new scheme to re-create Mi Young and Gun's first night together results in another hazy night. Daniel and Se Ra come to a shocking realization.
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