Hi! School: Love On (Korean: 하이스쿨: 러브온) is a 2014 South Korean television series starring Kim Sae-ron, Nam Woo-hyun and Lee Sung-yeol of the band Infinite. It aired on KBS2 from July 11 to December 19, 2014 on Fridays at 20:55 for 20 episodes
Hi! School: Love On is a teen fantasy romance series about an angel who has no choice but to become a human after unintentionally saving a male student in danger. The now-mortal angel then interacts with teenage high school students and learns about love, friendship, and what it means to be human
Also known as High School: Love On
Genre Romance
School
Supernatural
Teen
Comedy
Written by Lee Jae-yeon
Directed by Sung Joon-hae
Lee Eun-mi
Starring Kim Sae-ron
Nam Woo-hyun
Lee Sung-yeol
Opening theme "Heartthrob" by Infinite F
Ending theme "Chocolate Cherry Night" by Mad Clown and Yozoh
Country of origin South Korea South Korea
Original language(s) Korean
No. of episodes 20
Production
Producer(s) Sung Joon-hae
Production company(s) High School Co., Ltd.
UBICULTURE
Mong-jak-so Co. Ltd. (formerly IKORAI Co. Ltd.)
Release
Original network Korean Broadcasting System
Original release July 11 –
December 19, 2014

Plot
Sung-yeol and Woo-hyun are two 18-year-old boys who are both tormented by the emotional scars of broken families; Woo-hyun longs to see again his mother who left him as a child, while Sung-yeol lives with a stepmother that he detests and whom he blames for the break up of his parents' marriage. Both are considered asocial by Korean norms, although popular, brave and public spirited Woo-hyun drifts through school refusing to apply himself to his studies; Sung-yeol is studious and does well academically but is dismissive and disrespectful of his parents, aloof and detached from his classmates, appearing cold and arrogant to all. The lives of the two crash together when an angel falls from heaven
Woo-hyun's classmate, Kim Jin-young, harbours a crush for him. Fearing for her daughter's grades from her infatuation with a slacker, Jin-young's mother arrives in class and warns Woo-hyun to stay away from her daughter, publicly humiliating her. Unable to deal with her overbearing mother Jin-young prepares to jump from the roof of the school building, where Woo-hyun finds her.
Going about their business invisible to mortals are angels who guide the souls of the dead to the next life, one such nameless angel spends her time in between clients watching Korean soap operas and watching over the lives of mortals, including Woo-hyun and Sung-yeol. For this, she is chided for by a senior angel, "for its always the same story told over and over again just with different people." However the angel believes that by watching she can come to understand what it is to be human, and how mortals can love when the outcome will always be parting, and how they can live if death is all that waits