Since childhood, Yeonha has fervently pursued his dream woman, Soo-yi, undeterred by her repeated rejections due to their age difference. For Yeonha, Soo-yi has always been his one and only. However, a harsh reality check arrives when he learns of Soo-yi's marriage while serving in the military. Years later, following Soo-yi’s divorce, Yeonha's unwavering love for her remains unchanged and he sets out to make his beloved noona aware of how deep his feelings truly are. As time passes, Soo-yi finds herself slowly but surely consumed by the fiery passion of Yeonha's love.