Original: 우리는 오늘부터
A medical mix-up leaves a virgin pregnant with a child whose biological father is a CEO going through a divorce. Can they find a way to sort out this mess?
Woo Ri contemplates her abstinence pledge and is on the verge of letting go of all her beliefs with Kang Jae. Meanwhile, Raphael returns from the hospital after beating cancer and tells Ma Ri he wants a divorce. To change his mind, she secretly plans to get artificial insemination done with the last of his sperm. However, Woo Ri is at the clinic at the same time and gets it done instead.
Woo Ri tells Kang Jae that she's pregnant with someone else's baby, shattering his marriage proposal. Meanwhile, Raphael and Mi Ja find out about the medical mishap. Although Raphael supports Woo Ri, Mi Ja won't accept it and tells the chairman about what happened. Chairman Kim desperately wants a grandchild and approaches Woo Ri with a box of apples.
Woo Ri makes up her mind and decides to have Raphael's baby. She tells him about it amidst a murder that happens in the hospital that pleasantly shocks him. However, Woo Ri starts to doubt Raphael after seeing him with other women and reading online articles about him being a playboy. She starts to follow him around to confirm her suspicions.
Raphael finally remembers he met Woo Ri before by the East Sea and starts to think their second encounter is a string of fate. Meanwhile, Woo Ri's oestrogen levels heighten with her pregnancy, causing her to lust for Kang Jae. However, the letter she wrote to him explaining her needs and desires lands in Raphael's email box. She runs to stop him from reading it, but it's too late.
Seoung Il tells Woo Ri that he is her father. Woo Ri gets shocked by the news and becomes angry at Eun Ran for lying to her. She packs her things and leaves the house. Meanwhile, Seoung Il finds out about Woo Ri's pregnancy and then causes a scene at the hospital that gets filmed and posted online, causing public outrage.
Kang Jae starts to feel left out, seeing Raphael next to Woo Ri all the time. Woo Ri senses this and tries to make it up to him by going on a camping trip with him. But later, she becomes devasted after she learns Kang Jae had lied about not knowing of Ma Ri's affair and how he had covered for her so that it wouldn't alter Woo Ri's mind about giving them the baby once it was born, putting their relationship in turmoil.
Woo Ri feels horrible for breaking up with Kang Jae and has trouble eating and sleeping, which doesn't go unnoticed. She even faints. Raphael tries to shower her with good food and rest, but Woo Ri won't accept it openly. Meanwhile, Kang Jae tries to get back together with Woo Ri as he tracks down a suspect that could link him to Chairman Kim.
Woo Ri moves on but starts having dreams about Raphael. Raphael also starts to have visions about Woo Ri. However, whenever he tries to tell her how he feels, something gets in the way. Meanwhile, Woo Ri becomes known as the virgin miracle, and Ma Ri uses that to her advantage and sticks a video DJ streamer on her to harass her.
Woo Ri and Raphael tell each other that they have feelings for one another and kiss. Ma Ri, who just finalized the divorce with Raphael, overhears them and becomes frantic. Her mother tells her the only way to separate them is to get rid of the baby. Ma Ri listens to her and meets with Woo Ri. Meanwhile, Eun Ran and her mother go on a double date and find out something unexpected.
Someone breaks into Woo Ri's house to look for the necklace Ma Ri had secretly planted on her. As the culprit tries to get away, he injures Woo Ri's grandma, and she gets taken to the hospital unconscious. Meanwhile, Kang Jae receives a gift that leads him to Raphael's safe, and Du Pal gets away from Ma Ri and Mi Ja, causing them to go into hiding.
Kang Jae tries to stop Woo Ri from seeing Raphael, but Woo Ri doesn't believe Raphael has anything to do with Chairman Kim. After warning Raphael, he gets suspended from work for a week. Meanwhile, Raphael stays at Woo Ri's place for a few days and realizes Eun Ran doesn't think he is the right person for Woo Ri.
Kang Jae finds evidence in Chairman Kim's room, linking him to the murders. He arrests Chairman Kim, but things start not to add up as Chairman Kim gets abducted. As the chase goes on, Woo Ri gets stuck in the middle and gets taken as well. Kang Jae and Raphael rush to save her.
Kang Jae and Raphael apologize for what they did to Woo Ri and try to win her back. However, Woo Ri can't decide between Kang Jae and Raphael, driving her nuts. Meanwhile, Ma Ri tells Raphael her true intentions and identity, which leads to Kang Jae arresting Chairman Kim, the drug lord.
Woo Ri is just about to make her decision on who she is going to marry. But out of the blue, she ends up with appendicitis and gets rushed to the hospital. After Woo Ri recovers, she proposes to the one she knows will always be by her side. Meanwhile, Woo Ri's daughter, Ri Woo, comes into this world. And soon after, they celebrate her 100th day as a big happy family.
