When Sam-jae moves into their rooftop house against her wishes, Seo-young without telling Sam-jae moves into the wealthy Kang family as their latest hired live-in tutor of their youngest son, Kang Sung-jae (Lee Jung-shin), the job suggested by one of Seo-young's professors willing to prevent her from deferring her studies again.
Because Woo-jae's father, Kang Ki-beom (Choi Jung-woo), had always been desperate for his son to enter the family business, he accepts the terms and convinces everyone else to relent to this marriage.
Unfortunately, such a lie causes a rift with the twins as Sang-woo finds his sister leaving her family for a man unacceptable.
To his shock, Sam-jae accidentally attends his own daughter's wedding as one of paid phony guests and then hides his face to avoid being identified.
Lee Sam-jae, despite knowing his daughter lied to him about moving away to the United States, quietly accepts the situation and secretly watches over her.
When Sang-woo confronts Mi-kyung about the truth, she regretfully admits that she lied only because she wanted a true love and not someone going after her fortune.
While Sang-woo was angry, he also uses this chance to break up with Mi-kyung, citing their social class differences is too great and that his heart changed after learning about her real identity.
Despite the charade, Ho-jung told Sang-woo that she will wait as long as it takes for him to finally love her as a true wife.
Woo-jae, desiring to become a father, finds out that Seo-young secretly has been taking birth control pills behind his back, revealing her unwillingness to be a mother.
Furthermore, Sung-jae, who has successfully entered college thanks to Seo-young's educational assistance, discovers that he is not only adopted but also the illegitimate son of Kang Ki-beom and his secretary, Yoon So-mi (Jo Eun-sook), with whom he had one-night-stand.
Yoon So-mi resigns as the company's secretary and then, after seeing Sung-jae make peace, moves on with her life away from the Kangs.
Once Woo-jae's parents discover the truth, there is no recourse but divorce, and Seo-young assures her in-laws that she is already in the process to rectify the situation.
When the Lees discover that Seo-young was getting divorced, both the brother and father feel guilty as each believed this event was somehow triggered by themselves (which both technically did in different time frames).
In his own attempts to fix the situation, Sam-jae invites Woo-jae for a drink and to hear a story involving Seo-young's past.
Despite starting things over alone, Woo-jae always remains close as he still loves Seo-young, but she resists his advances and transparent ploy to "just be friends."
Eventually, the full scale of the truth comes forth, and the Kangs now understand her reasons and even welcome her back as they felt she has done many great things for the family, despite no longer affiliated with them.
She avoids her family the entire time because she fears Sam-jae would bring new troubles for her and she dreads the consequences of covering for her father.
Because of that car impact to his abdomen, his internal injuries begin to cause serious pains in his stomach, and it eventually lands him the hospital.
To make this a special moment, the twins would officially hold a second wedding ceremony with Sam-jae present together with his children.
He now works at a woodwork company making wooden furniture and made a special rocking-chair for Seo-young, who would be seen living a blissful life and no longer chained by her past sufferings.