From Miracle-Manhwa:
Mi Ryu has a gorgeous mother, a new stepfather,and she’s suddenly attracted to her new stepbrother, or is it stepbrothers?

Nareh and Tareh are fraternal twins, Nareh the elder sister and Tareh the younger brother. When Nareh learns that Tareh has been accepted into the all-boys Ordinary School, she is shocked, and prepared to stop him at all costs...
Source: mangaupdates

All Gun wanted to do was turn over a new leaf. A problem child since birth, Gun thought transferring to Northern Art High School and moving into the Lucky Residence would offer him a fresh start--a chance to begin again, away from his punch-drunk past.
He really should have known better. Whether it's having his attempts at romance with the lovely Seung-Ah thwarted time and time again by the lusty Ji-Ae, putting up with deliveryman Sung-Rae's dreams of heavy metal stardom, or dealing with Northern Art's gangs, Gun is going to have a very hard time shaking off his past. However, it's something he must do if he's to look towards the future, and Gun's future is a bright one indeed.
For on the hard asphalt surface of a bike track, Gun will finally lose his apathy and find himself. On the back of a motorcycle, Gun's life finally has purpose, and it's a purpose that will not be fulfilled, at least in Gun's eyes, until he's taken the checkered flag in the Korean Grand Prix.
(Source: MU)

A 28-year-old female prosecutor Min-seo is just about to go out with Jun-hyun, a good looking prosecutor whom she has had a crush on since high school. With a successful career and her soon-to-be boyfriend, it seems like she is the happiest woman in the world. However, she suddenly time travels to her high school life while she is chasing a male suspect named Sang-woo; he was a senior in her high school. She genuinely does not want to relive her high school life because it was just the stereotype of a nerd. With a strict moral code as a prosecutor, a teenager’s appearance, and two attractive men, namely Jun-hyun and Sang-woo, around her, her second high school life will be nothing like her previous one.

Magical JxR tells the story of two teenage wizards and the young girl they befriend: “Jay and Aru are two of the most popular students in wizardry school. However, before they can graduate, they must venture out into the REAL world and fulfill a one year magic contract with a human girl named Cho-Ah. Is Cho-Ah ready for a whole year with two enthusiastic wizards-to-be at her beck and call?"
(Source: Udon Entertainment)

Lee Woo-hee was kidnapped and found under a plum tree with a faint memory of a man telling her, "I promise you that until the day we meet again, you will be reborn." After that incident, her father became protective and would only allow her to go from the house to the plum tree she loved. However, she would be allowed to venture into the village on the day of the new moon. One such day she meets a exorcist that warns her of a man dressed in black. Will she take this warning to heart? Or is it already too late...?
(Source: Forte Atrox)

Yonggi had sworn not to fight anymore since the death of his teacher. It doesn't stop him from protecting the weak while trying to hide his true strength. But when Gihoon, an old associate of Yonggi, drives him in the world of illegal fights, the young man will suddenly be forced to review his principles...

It was love at first sight. The moment Hee-So’s eyes met Won-Jun’s she knew it was meant to be. Their relationship took off when Hee-So confessed her feelings on national TV, but less than a month later, Won-jun is ready to call it quits without any explanation at all. Hee-So’s had a lot of boyfriends — Won-Jun is number twelve — but being dumped is never easy. She’s not ready to move on to the thirteenth boy just yet. Determined to reunite with Won-Jun, Hee-So’s on a mission to win over her destined love once more.
(Source: Yen Press)

Shi, Hwa and Mong are sisters. They have something special: they are triplets. After losing their mother, they are each entrusted to a different family. Thus, Shi lives in New York; Mong in Japan and Hwa remains in Korea. Nine years later Shi comes to find all the three in Korea... What became of their father? And why were they separated?

Marriage is in shambles. But still their pride stops them from seeking each other. That's when both drift out to get the taste of some "Drugcandy" (adultery). A tale of two people exploring out of their relationship.

(Source: MU)

The impossible happens in 15th century Korea.
A princess who was disguised as her dead twin brother by her mother became king. Once her true gender is found out, the female king is sentenced to death by drinking a lethal dose of poison.
This story details the events of that forgotten king's life.
(Source: MU)

From Dazzling Scans:
A female manhwa artist lives with her two adorable pets, a dog named Diend and a rabbit named Shuba. However, Diend's scary demeanor and over-protectiveness towards her owner leads others to believe she's dangerous and vicious.

From ilovemanhwa.com:

A HIDDEN WAR AROUND THE SECRET OF SEOUL, THE 600 YEAR OLD CAPITAL OF KOREA. Joo-hee never dreamed he would be investigated in the Presidential Residency by making emergency calls to see the flame from the city center though he felt wrong to know noone else witnessed the flame at school. People from National Fengshui Office said Seoul is in danger, for some people are breaking the seals on the places of bad chi. Indeed, people are killed by unearthly monsters, and not knowing what talent he has, Joo-hee's life is swept to this hidden war.

In a time when Gods ruled with cruelty, no one dared to oppose them... A girl was offered to the wind god as a sacrifice. A tribe leader sets off on a journey of redemption while trying to save the girl and make her his wife. Kiron, while defying the Gods will, departs for a difficult journey. Will he be successful? And what kind of obstacles will the Gods throw at him?
(Source: MU)

From Tokyopop:
Yumi, a seemingly average high school girl, is destined to become the wife of and child bearer for Evil. As soon as her first menstrual episodes begin, all sorts of villainous cretins show up in the hopes of providing the seed for wickedness itself. In response, the forces of Good, a Buddhist priest, the Catholic church, and their attendant holy warriors rush to provide protection for the now-pregnable Yumi. But she reaches out to another warrior, a young punk freshman heartthrob who literally beats off the female population of the school with a stick. But when he sees Yumi in a vision, this cool-as-ice thug melts ... and the adventure begins ...

A single mother is diagnosed with cancer. What's worse, she is told that she only has one year left to live. She seeks to insure her daughter's future... by getting back together with her ex who she broke up with seven years ago.

Super Daddy 10 was adapted into a live-action drama series.

Korean manhwa based on a novel. Focuses on the heroine having reported a hit and run case which disrupts the family of one of the other main characters, Hui Won. In which he constantly abuses her whilst he falls in love with her alongs the way.
However, she has a boyfriend - Eun Gyu - who is the singer of an ongoing band.
Note that she is a strong girl and knows self defense herself.
*Full color, not black&white*
(Source: MU)

When Tae Yeon Im finds out that the idol star that she's adored for ages is currently attending the same school as her identical cousin, Jung-Woo Im, she convinces her cuz to exploit their similitude and switch places, she will dress as him, attend his school and try to get close to her lover boy. And he will dress as her, attend her school and revel in its sea of babes. Or maybe he just likes wearing a skirt? The plan seems flawless until Tae learns of a bully named Ga-Wun Kim who likes to beat up on poor Jung-Woo. Meanwhile, Jung-Woo finds that being a woman might not be as thrilling as it seems. New love story begins when Jung-Woo & Tae Yeon switch back to their own original identity. New characters starts appearing and now the story is focusing about Jung-Woo and his friends. What sort of love story that is going to begin this time? Let's find out.... :)