When they meet as college students, Yun Ji-su falls head-over-heels for Han Jae-hyun. In the present, she gets a troubling call from her son's school.
The snow traps Ji-su and Jae-hyun in town overnight. After returning home, Jae-hyun uses his resources to find out more about her personal life.
Jang Seo-gyeong's actions at the school anger Jae-hyun. Later, he warns Ji-su to stay away from the protests at his company.
Watching Ji-su get arrested for protesting reminds Jae-hyun of the person he used to be. Seo-gyeong throws a party with ulterior motives.
Ji-su takes extra part-time jobs to try and pay for the ruined dress. Her ex-husband discovers something disturbing among their son's things.
Lee Se-hun watches Jae-hyun and Ji-su from afar. In the past, Ji-su was forced to make a heartbreaking choice for Jae-hyun's sake.
Determined to protect Jae-hyun, Ji-su agrees to Se-hun's demands. Feeling suspicious, Jae-hyun begins keeping tabs on Se-hun.
Ji-su rethinks her decision. Jae-hyun stops by the prosecutor's office. Seo-gyeong spreads a false rumor about Ji-su to other parents at school.
At the nursing home, Ji-su's father and Jae-hyun meet again. A troubling realization leads Jang San to issue a threat to Ji-su.
Ji-su deals with painful memories of loss and news about her son's involvement in another fight. Jae-hyun answers questions about a tragic death.
The unfortunate truths behind Jae-hyun’s efforts come to light. Yun Hyeong-gu secretly asks Jae-hyun to come and see him.
While coping with grief, Ji-su finds a diary filled with secrets. Joo Yeong-u comes clean about the guilt he's been living with.
Ji-su realizes who's behind the sudden demolition notice on her house. Jae-hyun leaves Seo-gyeong shaken when he moves out of their home.
Jae-hyun disagrees with Ji-su on how to handle an incident involving the unfair dismissal of an employee at his company.
Suspecting Se-hun is somehow connected to the stabbing, Ji-su confronts him. Seo-gyeong refuses to give up on Jae-hyun.
As Jae-hyun pushes to bring the corrupt to justice, Seo-gyeong anxiously waits to see what happens. The police release Se-hun.