[Top 20] One Night Stand/Secret Pregnancies/Births in Korean Dramas

This list contains the Drama where Female leads friend got pregnant after a one night stand or The One-night Stand that Turned to a Fated Love.

My Secret Romance

Jin-wook and Yoo-mi meet at a Gangwon-do resort and get caught up in a series of misunderstandings and accidents. Yoo-mi was charmed by Jin-wook's sly and playful personality, and they unexpectedly spend the night together. However, Yoo-mi disappears in the morning, leaving Jin-wook feeling perplexed and irrationally angry. Three years later, the two meet again when Yoo-mi becomes a nutritionist at the company cafeteria where Jin-wook works. They pretend to not recognize each other, while fighting their attraction for each other.

Fated To Love You

A touching Korean drama filled with comedy about a girl who finds happiness, friendship and love in the most unexpected way!   

          

What's Up Fox?

They've known each other all their lives, but the 9 year age gap has made her like a big sister to the him. They land in bed one drunken night, beginning their amusing relationship. 

Wonderful Life

Wonderful Life is the story of two young college students who accidentally become parents because of the one-night stand they had during vacation. They then get married. 

A Gentleman's Dignity

A romantic melodrama about four men in their forties who have experienced life's ups and downs, successes and failures, and are unphased by whatever the world throws at them as they go through the second prime of their life.

I Love You

Suk Chul Soo and Na Young Hee are a newly wedded couple with an age gap of 14 years. This is a drama that tells the story of a couple who just had a baby because of a one night stand. It will portray the modern generation's view on love and marriage as well as the responsibility of raising a child. Park Byung Ho was thoughtless and threw away his child fora better income and life who later regrets this and learns to love.

Another Miss Oh

A romantic television series about two women who not only share the same name Oh Hae Young but they also share a destiny with the same man, Park Do Kyung, who can see the future. 

Thorn Birds

This is the story of two women, Seo Jung Eun and Han Yoo Kyung, who walk very different paths to achieve their desires. Seo Jung Eun is a strong and courageous woman who has suffered a difficult life, having grown up in an orphanage but continues to embrace people around her despite longing for affection herself. Jung Eun harbours the hope that she will meet her mother if she becomes a star,striving to reach her goal and overcome her suffering through her pure and innocent nature. In contrast, Han Yoo Kyung has a birth secret for which she is willing to throw away everything in order to get revenge.

Only You

Eun Jae (Han Chae Young) was a stubborn and head-strong girl who had a passion for cooking. She did not have any interest in going to college and with the help of her hig school friend, Jung Hyun Sung (Lee Chun Hee)ran away to Italy to enroll in a cooking school. Jung Hyun Sung who loved her dearly went along with her.

Yellow Boots

Sweet Yun Hwa becomes the unwitting stepsister of Yu Ra. Though Yun Hwa would love nothing more to be sisters with Yu Ra, the latter will have nothing of it, due to a sticky situation in which her long-term crush, Yun Jae, just happens to be Yun Hwa’s doting boyfriend. In a tragic instant, Yu Ra takes everything Yun Hwa ever had: a promising future, a loving boyfriend, and the comfort of her family.

Ojakgyo Family

The Hwangs and their four sons have been living in Ojakgyo Farm for ten years when Baek Ja Eun, daughter of the former owner, arrives at their front step staking a claim to the property, throwing their lives into disarray. 

Ho Goo's Love

Ho Goo has never dated in his life. He runs into his first love Do Hee. She is a member of the national swimming team and has a burning desire to win. She also talks like one of the guys. After Ho Goo meets Do Hee again, he becomes involved in a complicated romantic relationship and a dangerous friendship.

Super Daddy Yeol

Cha Mi-rae has been diagnosed with terminal cancer. To secure her young daughter's future, Mi-rae reaches out to her ex-boyfriend, Han Yeol. Despite his many flaws, Mi-Rae is resolved to change Yeol into the perfect father. 

Love and Secret

Chun Sung-Woon (Kim Heung-Soo) is the director of a large fashion company. He meets a single mother, Han A-Reum (Shin So-Yul), and becomes attracted to her. Due to Han A-Reum and her daughter, Chun Sung-Woon changes as a person. 

Best Wedding

While the love lives and marriages of those around her unfold, a famous news anchor makes the controversial choice to become a single mother. 

My Love By My Side

Do Mi-sol is a single mother who gave birth when she was a teenager and raised her son alone after her boyfriend dumped her. Years later, she falls in love with a kind-hearted man.

I Do, I Do

A woman is the top shoe designer at a shoe company. The woman is called "Gold Miss," because she is in her mid-30's, single, and financially successful. She mistakenly spends a drunken night with a counterfeit shoes peddler and becomes pregnant. 

Gogh, The Starry Night

At twenty-nine-years-old, Go Ho faces the struggles of the modern day woman, namely the struggles to succeed in work and romance in the 21st Century. An advertisement contractor who is unlucky in love, Go Ho works hard to be successful with her career, and only thinks of romance as an afterthought. But one day, an old flame turns up, taking on therole of her new boss, and suddenly it seems like every man is looking her way. Will the dust settle long enough for her to make the right romantic choices?

Good Job, Good Job

Lee Kang-joo is a ceramics technologist and single mother. Her ex-boyfriend Yoo Ho-nam hadn't known that she was pregnant when he left her to study abroad. Now a psychologist, he returns to Korea, but Kang-joo hides the fact that he's the father of her daughter, Byul. Meanwhile, Choi Seung-hyun is a fitness club owner and the son of Kang-joo's mentor and boss. He has loved Kang-joo since high school, but not wanting to lose their friendship, she's remained unresponsive to his romantic overtures.

Three Dads One Mom

Song Na Young and her husband, Jung Sung Min, desperately want a child but her husband is unable to get her pregnant. Her husband's friends decide to help them. But Na Young suddenly loses her husband in an accident and she gives birth to her daughter but does not know which of her husband's friends fathered her child. The father of Na Young's child can either be Han Soo Hyun, Choi Kwang Hee, or Hwang Kyung Tae.

(Source: MyDramaList, Wikipedia)