Oh Ha Na (Ha Ji Won) leaves a document at a coffee shop on her way to work and Sung Jae (Kim Myung Soo, L) hands it over to her. Ha Na goes to work with a good grace thanks to the young handsome guy flirting with her. Sung Jae joins the company as an intern and only then does she realize that he is the man who helped her in the department store.
Lee So Eun (Choo Soo Hyun), a new flight attendant with a airline where Choi Won (Lee Jin Wook) works for, shows interest in him after he rescued him from an embarrassing situation. The phone rings in the middle of dinner and Ha Na really cares that much by hearing her calling him 'Oppa (elder brother).'
Sung Jae is very impressed with her as she is highly skilled at dealing with a particular customer. While waiting for the actress with the intern, she lets a fart by mistake but he pretends that he doesn't notice it.
He calls her 'Noona (older sister)' without the titles and she starts to fall into a flutter at the young man who is very considerate of her feelings.
It is pouring and Ha Na feels miserable for looking at the ex-boyfriend holding an umbrella over his wife. When she is wet without an umbrella to get a taxi, Sung Jae lets her in under his umbrella.
Meanwhile, Won promises to meet his close friend as the flight is canceled. So Eun gets under his umbrella calling him Oppa on his way to her company.
The 18-year-old boy was secretly in love with the close friend.