[Trigger Warning: Mentions of death and suicide.]
Jae Hyun's father committed suicide at times when he was in the military. Chairman Jang and Ji Soo's father, ex-prosecutor Yoon Hyung Goo, were responsible for Jae Hyun's father's death.
Jae Hyun shared his story when his father died with Ji Soo as they met. During that time, he was in the military when he received the message, and it was the year where Ji Soo disappeared as well. He felt frustrated as he wasn't able to help and knew all the reasons back then after his father's death.
Since college, he fought for a cause to combat oppression and labor unions, but he lost everything when his father died for the same reason. Ji Soo comforted him and remarked that even though he grew up without his father, he was still warmhearted and hardworking.
A flashback of his past appeared wherein Jae Hyun was struggling back then. He remembered his father very well since he was always out in the school with the campaigns. He went to the military and always thought of Ji Soo during those times. When his father died, Ji Soo chose to live on her own away from him and her friends. He tried to look for her after his military service but to no avail. Both of them experienced death from their family, and Ji Soo chose to go on with life without Jae Hyun.
Meanwhile, Seo Kyung tried to reconcile with Jae Hyun. She asked him to visit the places where they started as a couple. Seo Kyung fell in love with Jae Hyun for his sincerity and care for her in the early days of their relationship. She wanted to win him back, but Jae Hyun is fixed to end their marriage. Jae Hyun spent four years in prison with a charge that Chairman Jang is responsible for. During his absence, his wife went out with other men.
At the piano school, Ji Soo got fired when she chose to teach a young girl for free. The owner received a complaint about what Ji Soo did and prompted her to do so. Jae Hyun learned that Ji Soo lost her job, though she doesn't accept any help when he gives it to her. Jae Hyun always sends her gifts and help through other people. This time Jae Hyun bought groceries and delivered it to Ji Soo's house.
Young Woo has been Ji Soo's good friend since college. He has one-sided feelings for her as he knew Ji Soo's heart only for Jae Hyun. What he does is to support and protect Ji Soo if she gets hurt by anyone.
It was a surprise to Jae Hyun when Ji Soo's father requested to see him at the sanatorium. This time, ex-prosecutor Hyung Goo is lucid, and as they met, he asked Jae Hyun for a view outside his room. He admitted to Jae Hyun what he did to his father and his resentment to Ji Soo. He confesses all the wrongdoings and asks for Jae Hyun's forgiveness. Jae Hyun was speechless for seeing the person who caused him so much pain.
Young Min received all the toys from his grandfather. He's happy that he recognized him after a long time. Hyung Goo taught Young Min to be a good boy and support his mother always. Late in the afternoon, Ji Soo received a call from the sanatorium. Her father is in the ICU as his pneumonia is untreatable. Ji Soo rushed to the hospital and waited for the doctor's update.
After a few hours of waiting, the doctor advised Ji Soo to see Hyung Goo inside the ICU room. He chose to take out all the life-sustaining treatment and machinery. As Ji Soo saw him, he asked forgiveness and advised her to live a happy life. He died after his last words.
Ji Soo was devastated by losing the person she took care of since her mother and sister died. As she stepped out of the hospital, Jae Hyun waited outside her. She walked towards him, leaned on for comfort as she lost all her strength.
