The unknown actress Na A-jung got married numerous times in reenactment TV shows, but she was too busy earning a living to even date. One day, her best friend of 15 years, Do-han, makes a tempting offer. "Act as my wife. Just for three years."

A-jung is confused by Do-han's sudden marriage proposal. But what confuses her even more is his brother Ji-han. Her plans are put on hold because of him, but it's the same for Ji-han. Just as he's about to get his brother to succeed the company, Do-han chooses A-jung over everything. Now Ji-han has to get rid of that shameless woman, and he even ends up giving her money to make them break up.

"I'll do it. I'll marry you." A-jung's sudden announcement makes Ji-han impatient. He can't become a cupid for his brother! He comes up with a new plan, but A-jung's and Do-han's plan is an elopement. Their "Wedding Impossible" mission begins to get Do-han away from his position as LJ Group's successor.

"I'm going to steal you from my brother." Ji-han's final plan to stop Do-han's marriage is to seduce A-jung? He begins his mission with confidence thinking he can make her fall for him instead, but… Who's the one actually getting butterflies?

"I guess I like you, A-jung." Did A-jung really succeed in getting Ji-han on her side? Her mission to marry Do-han seems to be going well, but can she and Ji-han truly get along? Meanwhile, Do-han's ex approaches A-jung.

I have a crush on Na A-jung?! Ji-han is troubled once he realizes his true feelings. Just seeing his brother and A-jung together hurts, and perhaps that's the real reason why Ji-han wants to stop their marriage. Meanwhile, A-jung and Do-han plan a meeting with their families, but A-jung feels uneasy about Ji-han's behavior toward her.