Big - Season 1 (2012)

While his body is still at the hospital, Kyung's family begins making plans regarding his estate. In the mean time, Kyung Joon manages to thwart Da Ran's plans to buy a new apartment for herself and Yoon Jae.

Da Ran realizes that Yoon Jae cheated on her and decides to cancel the wedding. Yoon Jae's mother learns of the canceled wedding and decides to take her son away.

After meeting him at a wedding, Da Ran is confident that she has actually met Kyung Joon. Ma Ri becomes increasingly suspicious of the body switch and decides to search Kyung Joon's apartment for answers.

Da Ran has changed her mind about marrying Kyung Joon and they share the news with Yoon Jae's mother. The events that follow end up leaving Da Ran with only two options: marry him or never see him again.

Ma Ri grows increasingly jealous of Kyung Joon's relationship with Da Ran and ends up making an impulsive decision that proves to be a mistake. As things continue to unfold, a major piece of Kyung Joon's identity is revealed.

Da Ran and Kyung Joon are supposed to be honeymooning, but they are constantly seen separately by different people. All the while, Dan Ran is starting to realize the truth about her feelings.

Da Ran is struggling to come to terms with the feelings she's developed for Kyung Joon. Se Young plays detective and uncovers the truth of Kyung Joon's connection to Yoon Jae.

Da Ran finally finds out the truth and realizes that Yoon Jae truly loved her. Meanwhile, Ma Ri and Kyung Joon keep inching towards information on the true identity of his father.

Da Ran and Kyung Joon go on a camping trip and finally give into their feelings. Unfortunately, he experiences an unexpected side effect of switching bodies and he now has to deal with Yoon Jae's illness.

Da Ran is confident in her feelings for Kyung Joon and decides to give back the ring. However, her initial course of action changes when truths about Kyung Joon's parents and Yoon Jae's illness are revealed.

After discovering that his mother was only using him, Kyung Joon decides to leave for L.A. Da Ran is able to stop him from leaving, but his return is going to cost him.

Kyung Joon has not yet switched back into his original body; however, he decides to pretend that his memories are gone in order to help Da Ran prepare for the switch.

Kyung Joon and Da Ran have been through their share of ups and downs, but they are fully committed to each other. They both swear to find their way back to each other after he switches back to his body.