From Forbidden Garden:

Lee Soon-Hee, a very athletic girl with extraordinary acrobatic skills, lives with her older brother who is a teenage genius. Her brother is already an instructor at a university, he tends to get annoyed by his younger sister's laziness and mischievous acts. A new neighbor moves in. He is a popular, self-centered, upperclassmen pretty boy. He seems to have taken interest in her due to her unique athletic features, which changes her normal lifestyle. How will Soon-Hee's new surroundings progress to?

Lee Uh In's family has long protected a legendary jar of alcohol with mysterious properties. Anyone who drinks from it will gain immense strength--and swap sexual orientation as well! But the jar only fills every ten years, and everyone who's drunk from it previously has died soon after. Enter Ichiro Yachi, who's unfortunate encounter with the liquor has left him liking guys and determined to take the jar back. Divine swapping, alcohol and an ancient legend? Things are about to get complicated.

From Pinoymanga Scans:

The girl with psychic abilities Sae-in, the pretty foreign boy Harvey and the top model Jin-song that Sae-in really likes.

An interesting story of the intertwined fate of these three teenagers. And who could be the guy that Sae-in is talking to through telekenesis?

As a young girl, AhSoo was involved in a plane accident. Years later, she has tried to move on from the incident. Everything seems to be going well, until she meets a person from her past. A transfer student has arrived at her school, and he is directly responsible for the plane accident AhSoo was involved in years ago.

From Yen Press:

Da-Eh, an aspiring manhwa artist who lives with her father and little brother, comes across Sun-Nam, a softie whose ultimate goal is simply to become a “tough guy.” Whenever these two meet, trouble follows. Meanwhile, Ta-Jun, the hottest guy in town, finds himself drawn to the one girl that his killer smile doesn’t work on — Da-Eh. With their complicated family history weighing heavily on their shoulders, watch how these three teenagers find their way out into the world!

The main character of this story is a girl with obsessive compulsive disorder. On a visit to her new school, she meets a fellow student, a "bad boy," and a handsome teacher. Things start to heat up later on, but who will she end up with?!