Two years after Tae-yong's disappearance, four men dressed in Joseon-era garments fall onto Park-ha's rooftop house. Park-ha has been missing for a prolonged period of time and it is revealed that she was in the US after Se-na abandoned her in a truck driving away when she was nine. Meanwhile, Tae-mu has been having a secret affair with Hong Se-na ( Jeong Yu-mi), his secretary, who, in turn, runs into her long-lost stepsister Park-ha ( Han Ji-min). Yong Tae-mu ( Lee Tae-sung), after killing his lost cousin in the United States, returns to Korea, claiming that his cousin, Yong Tae-yong ( Park Yoochun), could not be found in New York City.
The series aired on SBS from March 21 to on Wednesdays and Thursdays at 21:55 for 20 episodes. It is about a Joseon crown prince who, after his wife dies mysteriously, time travels to the future where he encounters familiar faces, modern-day devices, and corporate intrigue. Rooftop Prince ( Korean: 옥탑방 왕세자 RR: Oktapbang Wangseja) is a 2012 South Korean fantasy romantic comedy television drama, starring Park Yoo-chun, Han Ji-min, Jeong Yu-mi, Lee Tae-sung, Lee Tae-ri, Jung Suk-won, and Choi Woo-shik.