Ji Soo's mother and sister died in a fire accident on the day of her birthday. They went to the mall to buy her a cake and fix her sister's watch. It was the last time she saw them after she left to meet Jae Hyun.
The devastating incident was a sad beginning for Ji Soo that it parted her from Jae Hyun. When they left their hometown, her father lost his job, and Ji Soo left the university. It was painful for Jae Hyun as he never saw Ji Soo again, and she left him a note saying goodbye.
Ji Soo's father worsened as he lost his memory and suffered from depression. She placed him in a nursing home to be treated. Ji Soo suffers panic attacks every time she rides a train, and its blackout gives her the memory of the past. Jae Hyun learned about it on their way to school, and they picked up their kids. Jae Hyun helped Ji Soo understand the past. He also realized that they ended their relationship with no proper goodbyes. Jae Hyun encouraged Ji Soo to be strong and continue to fight to overcome her fears.
Joon Seo's classmates shared what they heard from their parents about the rumors of his father together with Young Min's mom. He rushed to Young Min's room and hit him. Young Min overpowers him and fights back with Jun Seo. Both children were separated as they are being treated with their bruises. Jae Hyun and Ji Soo were shocked by what happened to the kids.
Their classmates shared about the rumor in front of the principal. Afterward, they both explained to the boys their love story and made them understand the truth of what happened in the past.
Chairman Jang and his daughter Seo Kyung wanted to pursue the punishment through the disciplinary committee. They are persistent in having Young Min be expelled. The principal agreed with them since the school received big donations from their company.
On their way home, Jae Hyun received a call from the nursing home that Hyung Goo (Ji Soo's father) is missing. He picked up Ji Soo and Young Min at the train station as they arrived. They looked for Hyung Goo and found him all wet outside the emergency hospital where he last saw the dead body of his wife and daughter.
Hyung Goo began to cry and told Ji Soo that he missed his family so much, Young Min saw his grandfather's pain, but Jae Hyun comforted him. Ji Soo consoled his father as well.
The next day, the school called Ji Soo to inform her that the committee will be on schedule for the hearing. Young Min asked his mother to visit the school, and he wanted to talk to the principal. As they reached the principal's office, Young Min spoke to him.
Young Min decided to stop going to school and quit for good. He didn't want to face the committee as he didn't plan to hurt Joon Seo. The school didn't protect him when the students bullied him. Young Min cried as he left the school with Ji Soo.
Seo Kyung invited Jae Hyun's mother to dine in their house. She shared with her about Jae Hyun's decision to get a divorce because of Ji Soo. Jae Hyun was surprised to see his mother waiting for him later that evening. She advised him about what Seo Kyung told her in regards to the divorce. She is unhappy about his decision and her grandson's life. Jae Hyun was disappointed to hear it from his mother.
Ji Soo visited Chairman Jang and told him not to put a tail on her, and she is not interested in his offer. Ji Soo called Jae Hyun and asked to meet him. She wanted to know the story about his father and one employee that committed suicide. Jae Hyun agreed, and they met and talked about the accusations with the company and the employees. Jae Hyun shared that his father committed suicide because of Chairman Jang's management.
