One Girl, Four Aliens

During Christmas break, a normal student who is studying in Seoul, Song Yoo Ae, encounters a UFO unexpectedly crashing on her back yard at the middle of the night. Then four handsome men reveal themselves as they stepped out on the UFO, naming themselves as Park Sung Ho, Do Jong Hyun, Youn Min Woo and Choi Yoon Jae. Now the problem is, how will Yoo Ae go back to her normal life, if these four aliens shamelessly barged into her house and forcing her to teach the way on how to act like a normal human being. They aren't giving her a choice though, it's either obey or be killed.

Then one question was stuck on her mind, that was yet to be answered, "What are their real motives? Why did they visit earth? And most importantly, why the heck is she falling over heels over one specific alien?"