Song Woo-yeon, an ordinary high school student with low self-esteem, finds herself posing for a painting while out with friends. She's then invited to the mysterious croquis group "Spirit Fingers." Seduced by the handsome Seon-ho, Woo-yeon joins the group. However, there, she encounters Ki-jeong, the younger brother of fellow member Green, who witnessed her embarrassing behavior at the hands of a bully.
