Pretty Sister

Byung Chul, a graduate of a prestigious university, is a preparatory student. He has a crush on his younger sister, Ji Young, who saved her from childhood youth. Ji Young is dating celebrity manager Ji Wan, who was once a big fan of her, but she doesn't love her. By chance, he dreams of a new love with him again, but Ji Wan starts to hinder their love.
(Source: TMDb)