Gyeong-ah, a dedicated caregiver working tirelessly to help those in need, finds herself living alone in a small apartment. Her life revolves around her work and the cherished memories of her late husband. The only person she can truly rely on is her daughter, Yeon-su, who recently moved out on her own to pursue her dreams. However, seeing her daughter has become increasingly difficult as they struggle to maintain regular contact due to their busy schedules. Meanwhile, in a different part of the city, Yeon-su finds herself entangled in an emotionally draining argument with her ex-boyfriend, Sang-hyun. Despite his persistent attempts to win her back, she remains determined to move on and focus on rebuilding her life. Weighed down by the stress and heartache, Yeon-su finally decides to visit her mother at home, seeking comfort and advice. Upon leaving, Gyeong-ah receives an unexpected text message from a stranger, which shakes her world. The mysterious sender claims to have information that could change everything she thought she knew about Sang-hyun's intentions towards her daughter. As the pieces of this complex puzzle begin to fall into place, Gyeong-ah must navigate through her emotions and gather enough courage to face both her past and the uncertain future that lies ahead.