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.

Ji-han finally accepts A-jung and Do-han's marriage and is no longer in their way... But why does A-jung feel uneasy? Things become even more complicated when reporters gather around her home, forcing A-jung to flee to Do-han's house. But things start to get tense as the three begin to live together...

Ji-han finds out about Do-han’s secret, but rather than being shocked, he’s worried about A-jung. Ji-han wonders if A-jung knows the truth and decides to oppose their marriage once again. Ji-han's persistence confuses A-jung more than ever, but deep inside, she believes he might be able to save her from everything. Meanwhile, Do-han becomes tired of Ji-han's whims.

Ji-han and A-jung finally confirm their feelings for each other, but they still can't be completely honest. A love between a soon-to-be bride and her future brother-in-law... Will things really be okay?

Ji-han gives up everything for A-jung. Neither LJ Group nor his grandfather’s acknowledgment are as important to him as her now. But A-jung feels pained to see him do so, and so does Do-han. The time has finally come for everyone to stop acting and be honest. Will they be able to protect each other?

Is it coincidence or fate? A-jung and Ji-han reunite after a year, and their story begins anew.