After his parents remarry, Narim finds himself harboring a forbidden crush on his new stepbrother, Sewun. One day, he overhears Sewun’s “ideal type” is someone who knows their way around the bedroom - which causes Narim, who doesn’t even have any experience with love or relationships, to panic. Hoping he can teach himself, he impulsively buys a box of sex toys. But when his friend Taehyeon discovers them during a visit, he’s baffled by Narim’s plan…only to make an outrageous offer instead: “Why not practice with me?” Does practice really make perfect, or is Narim’s hope for some action a lost cause?