Kyungsoo's first love

SM High School, attended by D.O. of Korea's top idol group XO. One day, a female student named Jeong Eun-bi transfers to SM High School from Source High School. D.O. wasn't originally interested in girls, but he falls in love with Eun-bi after seeing her. However, love isn't easy due to the interference of a girl named Hwang Eun-bi. What will become of Kyung-soo's fate?