Since she was in junior high school, Lin Xueman has been unrequitedly in love with her class monitor, Mo Siqi, who is ranked first in the grade. Her name is a bit like a girl. She is also a typical Korean handsome boy, reticent and gentle in temperament. He often stares with a pair of innocent eyes and shows a harmless smile. Until she graduated from high school, Xueman didn't have the courage to tell him that he liked him. Mo Siqi is the boyfriend of the class beauty, and they are recognized as a perfect match. Until after graduating from high school, bad news came during the summer vacation. Mo Siqi died. From then on, Xueman's outlook on life was completely overturned. The person who killed him turned out to be himself...