It's Valentine's Day and love is in the air! After reading a love poem thrown away by Adrien, Marinette comes to the conclusion that the poem is about her, making her ecstatic. Meanwhile one of her classmates, Kim, is planning to ask his crush to be his Valentine. Marinette, in her love-sick daze, encourages Kim to go for it. When Kim sees his crush, he is humiliated and rejected cruelly. Heartbroken, Kim is influenced by Hawk Moth and turns into 'Dark Cupid', a villain whose arrows can replace true love and friendship with pure hate and mean-spiritedness.