Na A-jung is a talented but unrecognized actress. As a reenactment actress, she has worn wedding dresses and attended countless weddings, but she is too busy surviving to find love herself. One day, her friend of 15 years, Do-han, makes a surprising proposal: "I want you to pretend to be my wife!".

Confused by the sudden proposal, A-jung eventually agrees—only to face strong opposition from Do-han's younger bother, Ji-han, who tries to stop her at every turn. As Do-han gives up his inheritance for love, Ji-han, convinced A-jung is a fraud, even offers her money to leave him.

I'll do it—the marriage. Ji-han is devastated by A-jung's bombshell. I can't be a matchmaker like this! He comes up with another sneaky plan. Meanwhile, A-jung and Do-han's plan is 'Runaway in Love.' The 'Wedding Impossible' operation to escape from the successor of LJ Group begins.

I'll try to take away Ms. Na A-jung from my brother. Ji-han's last plan to stop his brother's marriage was to flirt with A-jung. She can't marry my brother if she falls for me! He carries out the plan to make her heart pound with overwhelming confidence. But wait, whose heart is beating?

I may like you, Ms.A-jung. Did A-jung's strategy to make Ji-han on her side work? The success of the 'Wedding Impossible' plan was in sight for a moment, but can two people who cannot be liked be close? Meanwhile, Do-han's ex-lover approaches A-jung.

Wait, do I like Na A-jung?! Ji-han realizes his feelings and is in agony. Just seeing his brother and A-jung together makes his heart ache, and maybe this is the 'real reason' he wants to break up the marriage? Meanwhile, A-jung and Do-han plan a family gathering, and A-jung is anxious about Ji-han's provocation.