From NOIR:

Lena Ha is a beautiful and a tough girl who is the captain of the kendo team. She meets Hye-Min Kang, the son of the president of a big company in Korea, and the two seem to fall in love at first sight.

But when Lena learns that she and Hye-Min are half-siblings, she runs away and falls into a strange body of water. When Lena wakes up, she finds herself in a strange kingdom...and learns that she may be its only hope. Now Lena, disguised as Ley, is ready for many adventures.

From Sensation Scans:

Seo Kyoung is pitiful. Everyone thinks she is, especially after making the wrong "friends," she now has to prove that she does have a boyfriend. She accidentally chooses the most popular guy in school... And... he starts to like her. But his best friend likes her too. What will happen?

Yurim Han has just been accepted to the exclusive Yusung High School, known for its high standards. Expecting that, she is still shocked by the level of excellence. Every student around her is a freakishly gifted genius! It's high school life on cognitive enhancement drugs. Can Yurim survive in such an environment?

Mysterious murders have been taking place in town lately and everyone is uneasy. Anne may look like an ordinary teenage girl in plain human’s eyes but she has something unique that attracts Vampires. May it be her blood type or even something in her skin that makes vampires so attracted to her? No one knows... One thing is for sure, Vampires keep coming in the city she lives in and they are even in her school now! Luckily for her, she has her brother to protect her and also one mysterious new guy...