Main •
Seo In-guk as Louis / Kang Ji-sung (25 years old) :The last surviving heir of a chaebol chairman. Having grown up in a sheltered and pampered environment in France, he turns to retail therapy to curb his loneliness. One day, he finds himself dropped into the bustling Seoul after having lost his memory. •
Nam Ji-hyun as Ko Bok-shil (21 years old) :A country bumpkin from the
Gangwon Province, who has a sweet personality. Though she is illiterate with technology, Bok-shil is quick on her feet and adapts well to situations. •
Yoon Sang-hyun as Cha Joong-won :The director of Gold Group's merchandising department and Goldline.com. He has a prickly personality and is Louis's rival in love. •
Im Se-mi as Baek Ma-ri :Louis' childhood friend, who has a one-sided love for him because of his title. She later falls for her boss, Joong-won.
Supporting People around Louis •
Kim Young-ok as Choi Il-soon, Louis' grandma and the Chairman of Gold Group. •
Kim Sun-young as Heo Jung-ran, Il-soon's assistant •
Um Hyo-sup as Kim Ho-joon, Louis' butler
People around Bok-shil •
Ryu Ui-hyun as Go Bok-nam, Bok-shil's brother •
Kang Ji-sub as Nam Joon-hyuk, Bok-shil's detective friend
People around Joong-won •
Nam Myeong-ryeol as Cha Soo-il, Joong-won's father •
Kim Bo-yeon as Shin Young-ae, Joong-won's mother
Employees at Gold Group •
Kim Kyu-chul as Baek Sun-goo, Ma-ri's father; and the President of Gold Group who schemes to take over the conglomerate. •
Yoon Yoo-sun as Hong Jae-sook, Ma-ri's mother •
Yoon Sa-bong as Yeji •
Kim Byung-chul as Lee Kyung-kook •
Cha Chung-hwa as Kwon Mi-young • Lee Jae-kyoon as Byun Do-jin
Rooftop Neighbors •
Oh Dae-hwan as Jo In-sung •
Hwang Young-hee as Hwang Geum-ja
Special appearances • Mi-ram as Park Hye-joo •
Chae Soo-bin as Wang Mong-shil ==Production==