The investment for the Korea Medical Foundation falls through during the second investment review. Chairman Han suffers a heart attack and is brought into Korea Hospital. Hye Won gets meddled in a school violence incident, putting her father's job at stake.
Jun Hyuk suggests that Hye Won switch the transplant priority between Mr. Kang and Chairman Han. Meanwhile, Ju Ran still holds a grudge against Man Jong and Eun Dong, getting Man Jong fired. Ji Hoon is forced to apologize to Eun Dong about the car accident.
Man Jong overhears the deal between Hye Won and Jun Hyuk and gets chased. Meanwhile, Eun Dong witnesses her father's fall while trying to look for him in the hospital. Jun Hyuk announces to the media that it is a suicide attempt. Tae In feels suspicious about the whole thing.
At the hospital, Eun Dong asks Jun Hyuk to tell her the truth about her father's accident. Tae In tells her to stay away from Jun Hyuk. Hye Won is invited by Chairman Han to his house and Tae In finds out about the secret between her and Jun Hyuk.
Jun Hyuk pays someone off to get his cell phone from the audit room before it gets restored, so Tae In’s plan fails. However, Eun Dong gives him crucial evidence that Man Jong hid somewhere. With it, Tae In confronts Jun Hyuk and Young Gook. Hye Won overhears their conversation.
Il Seob is in critical condition and Man Jong has been declared brain dead while Eun Dong remains in prison. Eun Dong keeps waiting for Tae In who doesn't come visit her anymore. Jun Hyuk and Hye Won offer an unjust proposal to Tae In.
Eun Dong realizes that Tae In has betrayed her for good and her trust for him turns into grudge. Tae In leaves for the US branch as he cannot stand the sense of guilt he feels. Jun Hyuk and Hye Won tell their family about their relationship.
Eun Dong submits a resume to Seo Ju for the stylist position. Ji Hoon calls her over for a job interview. The interviewer happens to be Tae In. While interviewing her, he finds out that Eun Dong had to serve extra time in prison, and she thinks it's either Jun Hyuk or him who did that to her.
Eun Dong damages Jun Hyuk's car in anger when Tae In comes to stop her. Myung Hee tells Ju Ran that Hye Won has been visiting Tae In in his office. Chairman Han gives Seo Ju permission to get married to Tae In. Jun Hyuk finds where Eun Dong lives and he goes to threaten her.
Cha Eun Dong has always been an upright citizen who has stood up against injustices. Coming from humble beginnings, she has also practiced patience. Unfortunately one day her family is cast into turbulence after she is betrayed by the one person she confides in. After being brutally deceived, Eun Dong is reborn by the burning fire of vengeance as she swears retribution. In contrast, Kang Tae In has always been a rational man of morals who has always kept his word. Starting as a lowly employee to now the chairman of F Sports Group, he has only depended on himself for a better life. The one promise he has broken was the one he made to Eun Dong, after having to choose between her and his chance for greatness.
Jun Hyuk tries to use the mistake made over the contract with Huei against Tae In. Eun Dong sides with Myung Hee and is asked to carry out a task for her. Tae In admits his mistake over the contract and tries to take responsibility.
Seo Ju confesses that she was the one at fault, not Tae In. As a result, Chairman Han's trust for Tae In deepens. Tae In notices that there's someone behind Eun Dong. Il Seob no longer opposes Tae In's marriage.
Eun Dong becomes emotional when she comes to the place where Man Jong fell. Tae In witnesses Ji Hoon trying to calm Eun Dong down. He senses something between them. Meanwhile, Jun Hyuk contemplates using Eun Dong for his plan to take revenge.
Hye Won tells Tae In's parents to make him fire Eun Dong. Eun Dong hears the whole thing, asks Tae In to buy her a drink, and confronts him. She tells him what Hye Won did to her in the past. Chairman Han reminisces about his woman from the past.
After Eun Dong saves Gwang Hoon, the whole family starts trusting her more. Jun Hyuk tells Hye Won that Eun Dong is Tae In’s only weakness after seeing her in a hysterical state. Eun Dong tells Jun Hyuk to do whatever he can to get married to Seo Ju.
Hye Won exposes the truth about who destroyed Jun Hyuk's car in front of Chairman Han. More people start to get suspicious of Tae In and Eun Dong's relationship. Seo Ju senses that there's something between the two and makes Eun Dong help Tae In set up a marriage proposal.
Eun Dong finishes all the preparations for Tae In's proposal. She is torn about what to do after Jun Hyuk offers to help her if she does what he asks. Ji Hoon loses his cool after finding out that Eun Dong is in the same hotel room with Tae In.
Jun Hyuk watches a video of Hye Won with Tae In and gets furious. After the staff dinner, Eun Dong asks Tae In why he kept the truth from her. Tae In proposes to Seo Ju. Eun Dong visits Tae In's house and she finds something shocking.