Ugly Alert follows the life of Gong Joon-soo, a man who takes the blame for his younger brother's crime and serves time in prison. After his release, he struggles to reintegrate into society while trying to support his step-family, who are initially unaware of his true nature and past. His unwavering kindness and selflessness eventually begin to thaw the hearts of those around him, including his cold-hearted step-sister, Na Do-hee. The series explores themes of forgiveness, redemption, and the true meaning of family. As Joon-soo navigates the complexities of his new life, he faces professional challenges at a fashion company and personal hurdles as he tries to protect his siblings. The drama highlights the transformative power of love and the resilience required to overcome societal prejudice and past mistakes.