Fashion King (film)

Fashion King Hangul RRPaesyeonwang is a 2014 South Korean film that comically depicts the coming of age of a high school student as he matures into adulthood and discovers a passion for fashion design.

Woo Kimyung, a completely ordinary high school student, has a crush on Hyejin, the prettiest, most popular girl in class. So to win her heart, he decides to transform his image and become the coolest, best dressed person in the world. As his mentor Namjung introduces him to the world of fashion, Woomyung finds himself entering into a rivalry with Wonho, the schools toughest fighter. Meanwhile, he doesnt notice Eunjin, who harbors a secret crush on him.

Source: Wikipedia