Ryu Ho-sun and Choi Hwa-jin are set to have arranged marriage, but she disappears during their wedding. Choi Ki-wan pretends and dresses up as a woman instead of her.
Ki Wan, now living as his sister Hwa Jin, finds himself in a predicament while shopping for clothes with Ho Sun's family. Ho Sun comes to the rescue at the last minute. Meanwhile, Jin Hee starts to pester Hwa Jin about doing household chores, lying that her mom wants Hwa Jin to do them.
Ki Wan and Ho Sun dodge another dangerous situation with his mother and grow a little fonder of each other in the process. Later on, Ki Wan receives news that his sister has finally returned. Ho Sun becomes angry when he sees her, and he also feels sad that he must now part ways with Ki Wan.
Hwa Jin saves Jin Hee from getting assaulted by strangers. Later, Jin Hee opens her heart to Hwa Jin and tells her how she felt jealous when Hwa Jin married her brother. Meanwhile, Tae Hyung visits Ho Sun's house and wishes to meet his wife. Over a meal prepared by Hwa Jin, Ho Sun reminisces the times he approached Hwa Jin with sincere feelings.
Ho Sun must intervene when Jin Hee and Hwa Jin have a falling out over the skirt that Ho Sun's mother bought for Hwa Jin as a present. Meanwhile, Ki Wan gets some news about the possible whereabouts of the real Hwa Jin. When she sees her brother and his wife heading out together, Jin Hee decides to follow them.
Tae Hyung declares his love for Ki Wan, thinking that he is Hwa Jin. Afraid that he might get too close and find out about his real identity, Ki Wan asks Ho Seon to help get rid of him. Meanwhile, Lord Choi is furious that Ki Wan and his men have yet to find Hwa Jin. Ki Wan ensures him that they will find her soon.
Ho Sun decides to go to a remote town and focus on his studies. However, all he can think about are his memories of Ki Wan. Meanwhile, Tae Hyung visits Ki Wan and delivers a letter. Upon reading the letter, Ki Wan decides to stay true to the vows that he made at his wedding with Ho Sun.
Ho Sun is a young nobleman who gets married to a young lady named Hwa Jin. As per custom, he finally gets to see his bride's face for the first time on their wedding night. However, his bride turns out to be someone else, leaving Ho Sun in a state of confusion and panic. To make things more complicated, Ho Sun's mother comes calling for the newlyweds the next morning.
Ki Wan leaves a note for Ho Seon and returns home. Both Ho Sun and Ki Wan are reminded of one another when they see items from the time they shared. Meanwhile, Tae Hyung comes to ask questions about his suspicions. Later on, Ki Wan goes to see Ho Sun as he drinks to his sorrows.