This is actually a collection of short stories. The first one goes like this: Two high school girls are complete enemies, and they both are in their own gangs. They fight each other all the time, and to get even with the other, one girl tries to kidnap the other's boyfriend. But the information her right-hand girl gives her is wrong, and they kidnap some really good-looking guy who is NOT the boyfriend of the other girl. You know what happens. They fall in love. (from entropy scanlations)

A bloodstained man stands in front of a terrified girl. He proclaims his love for her and makes this ominous declaration: A year from now, she will either die alone or will be with him forever. Now, rumors abound about the cursed girl that causes any boy who proclaims his love for her to die. Join us to discover the mysteries of Metronome.

From Tokyopop:
Gods and demons wage a neverending battle with the mortal realm as their battlefield. As with most longstanding feuds, the reasons are no longer important--hatred is a way of life. But it is foretold that one would arise who could restore harmony between gods and demons. Enter Raenef...heir to a set of demon royalty, he is hardly courtly material. The demon king assigns Eclipse to be his tutor, to mold Raenef into proper demonic shape. The two begin a journey of discovery and are soon joined by a human knight and a god-blessed priest.

From Mari Lex:
As a demon lord in training, poor Raenef just doesn`t seem to make the cut. With his unbelievable innocence and neivity, not to mention unbearable cuteness dispite trying to look scary, he only agreed to become a demon lord for the free food. Will he ever become a successful demon lord???

The beginning of destiny to save the world. The battle's prelude revolves with the fate of the seven boys. BTS (Be the Shield) Become a shield of the Earth Guard! (Source: NATE.com)

A new teacher, Miss Jung, has a student she particularly worries about. Ryu Min is the top student in the school; he's tall, smart, and handsome. He shocks her by telling her that he wonders what it would feel like to kiss her. What is she to do about him?

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.... :)

Dokebi Cafe: Sacred Grounds for Those Who Wait

"I will only love you even if I were to be born a thousand times."

Gangeun is a poster girl for bad luck.
She's a magnet for accidents small and large.
Just when she's getting used to her eventful high school life, she encounters a strange "boy" named Mooyoung in front of a new cafe.
What is this curious place? Who is this mysterious creature in the form of a boy?
Bad luck seems to have left Gangeun but there's so much more that awaits her.

(Source: Net Comics)

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.

To research the cause of his sister's death and the culprit of this, Li Ji Lin intentionally enters a club posing as Jiang Wu's lover; whose relationship was created only to be able to enter the club, when he enters the club and investigates thoroughly discovers the culprit and wants revenge, but does not know that he is in danger since he was selected by the members as "The prey"

Woo-jin is headed home for a memorial service. Da-hong is searching the countryside for someone she used to know. Their paths cross when Woo-jin ruins Da-hong's fruit basket (which she had bought as a gift) by accident, and ends up taking her to her destination in his car as an apology. Unexpectedly, the place Da-hong has been searching for is Woo-jin's own home?! What is their relationship to each other...?

Two centuries after the establishment of the Joseon dynasty, a long war breaks out because of the Japanese invasion. Four beings, both human and celestial, struggle to correct the balance of the universe: Eun-dong, a boy who lost his mother to the war and is now searching for his father; Tae-eul, the Angel of Death who seeks to solve the mystery of the lost souls, the honorable 800-year-old Tiger Heuk-ho, and the nine-tailed fox, Ho Yu-hwan. This is their story.

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)

Year XXXX, The Age of Chaos, a
dictator meets a vampire who
has awakened from 300 years of
slumber and is hungry for
some tasty blood.

From Dan of Population GO:

Heters are humans who have gained superpowers. Each heter has super regenerative abilities and one additional power. Miru is a man who hunts heters, these hunters are known as Closers. It is clear that Miru has a past with heters and will stop at nothing to hunt them down.

Choi Hong suddenly becomes the stylist of a popular boy band, Real Monsters, after discovering they are actually supernatural beings who desperately want to be human. It becomes her task to transform the band of fashion misfits into fashion icons so that they can obtain the love from their fans they need, in order to become human for good.

Yu Mano wanted a job where he wouldn't have to deal with lots of people looking at him, and maybe where he could get some of his college homework done during breaks. Being an albino in South Korea, he always stands out. There's this creepy yet eye-catching mansion in his neighborhood that somehow is a library, so he decides to work there part-time for a while.

But his annoyance level soon shoots through the roof because every single one of the (admittedly gorgeous) librarians there are vampire otaku! They even dress and talk as if they are vampires—and as if they're certain he is one, too!

After an awkward first encounter with the head librarian (including being dragged into his elegant coffin), he is determined to never go back, but....

(Source: myreadingmanga)

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.

The "self bully" Ban has a normal enough life, and where divorced parents aren't that uncommon, her life becomes shadowed in mystery when her mother, Eun-Joo, suddenly brings their "distant relative" Jin-Whan home to live with them. Ban’s mother would always avoid the topic of her family, so who is this strange boy? Are they really relatives? What torturous secrets does her mother's past hold? And what do the sudden strange happens that follow in Jin-Whan's wake mean? Would a better question not be who is he, but what?