Choi Sang-eun gives customized marriage contracts for singles needing a marriage. After 13 years in the business, she wants to retire but finds it hard to end it with Jung Ji-ho, a long-term customer of Mon, Wed, and Fri. They've been together for 5 years, but she knows nothing about him and delays ending their contract. Meanwhile, superstar Kang Hae-jin moves in the top floor of Ji-ho's house.

Sang-eun's hurt by Ji-ho asking to end the contract first. She delays it giving a flimsy excuse. She's strangely upset with him and is confused by it. Meanwhile, Hae-jin sees his first love Sang-eun who disappeared 13 years ago after leaving a strong impression but is shocked she is Ji-ho's wife. To make the matters worse, he witnesses Ji-ho's strangeness and believes that she is in danger.

Sang-eun, Ji-ho and Hae-jin have a three-way encounter at the mansion. Ji-ho reveals his identity to Hae-jin due to his suspicion. Sang-eun gets to know Ji-ho a little bit more but despite what she wants the time to end the contract comes. When the contract ends, restless Sang-eun visits Ji-ho with divorce papers as an excuse to see him but is attacked by a mysterious armed man.

Sang-eun's surprised at Ji-ho giving her concert tickets, not divorce papers. They extend their contract as they run into his senior judge and his wife. Madam Yoo is in big trouble after seeking a comeback after losing everything 13 years ago due to Sang-eun. Sang-eun saves her and give up her retirement despite her love-hate relationship. Meanwhile, Hae-jin gets into trouble from a false rumor.

Sang-eun is angry at Hae-jin. Hae-jin asks Sang-eun to take him as her customer. She is torn seeing him vulnerable and eventually, she accepts his offer. Ji-ho feels uncomfortable about their contract. Sang-eun tries to clear up the misunderstanding but is not easy. Meanwhile, Madam Yoo is released from the detention center and stays at Sang-eun, and their uncomfortable living situation begins.

Sang-eun needs to settle a contract with Hae-jin. After some quarreling, Ji-ho's day is Mon, Wed, and Fri and Hae-jin on Tues, Thur, and Sat. And the alternate-day marriage begins. Meanwhile, Sang-eun and Ji-ho prepare a housewarming party for his work. While decorating the house they develop feelings. At the housewarming party, Sang-eun drinks too much and gets a serious blackout the next day.

Sang-eun remembers her first kiss with Ji-ho but is upset as Ji-ho seems indifferent. They hide their feelings causing their relationship to be awkward. As Hae-jin uses work as excuse and goes on a date with Sang-eun, he's feelings towards Sang-eun grows even more. Meanwhile, Madam Yoo visits Ina group and threatens to take back Sang-eun into their family again.

Ji-ho tries to find a way to express his feelings toward Sang-eun. During a couple's golf gathering, he doesn't hold back to show kindness and care towards Sang-eun causing her to have mixed feelings about him. Meanwhile, Hae-jin happily waits for Tues, Thurs and Sat but gets into a big fight with Ran-hee who questions about Sang-eun. He then collapses in front of Sang-eun due to extreme stress.

Sang Eun meets Ji Eun, ex-wife of Ji Ho and a legal advisor of Hae Jin. Ji Ho says no more than there's nothing between them but Sang Sun's thoughts get tangled. After filming, Hae Jin misses Sang Eun and visits her but drunk Ji Ho appears and three of them have an awkward gathering at the beach. When Ji Ho witnesses Hae Jin and Sang Eun being close, he appears to be bothered for the first time.

Ji Ho and Sang Eun realized their feelings for each other and he surprises his co-workers by coming to work very differently than usual. Sang Eun tries to end the contract with Hae Jin to focus her relationship with Ji Ho and Hae Jin tries to give up his feelings for her but finds it difficult. Meanwhile, Ji Eun finds out Sang Eun had contracts with both Hae Jin and Ji Ho and visits Ji Jo's house.

Sang Eun worries about Ji Ho as she is exposed to the public. Ji Ho's senior informs about his promotion but doesn't tell Sang Eun. Sang Eun tells Gangjin group's family she doesn't want to marry Hae Jin. Ji Ho makes questions for Sang Eun and they have a great time. While Hae Jin's at the police station due to his clash with Sang Eun's stalker. Sang Eun's in shock when the stalker is revealed.

Sang Eun's 12th marriage is unveiled causing controversy and she insists she's at fault to protect Hae Jin. She asks Ji Ho to have some space due to this. Ji Ho and Hae Jin is upset seeing Sang Eun trying to bear everything. Ji Ho hears from Gwang Nam of Madam Yoo's provocation to Sang Eun and investigates her and Ina group. Hae Jin prepares a conference to squelch criticism towards Sang Eun.

Sang-eun rushes to the hospital in shock when she hears of a mysterious car accident. Ji-ho comforts her and they become closer. Hae-jin makes a formal announcement of his breakup with Sang-eun. Chairman Ganjin tells him to join Gangjin group. Seon-jin feels threatened and uses Sang-eun to ingratiate himself with his father. Meanwhile, Ji-ho questions the car accident and starts investigating.

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