Rooftop prince (2012) with English Sub Title $Trainer-1$

Park Yoochun as Prince Lee Gak / Yong Tae-yong

He is the Crown Prince in the Joseon era. Intelligent, kind, wise, cautious and exercises good judgment though a little pompous and prone to think highly of himself (as expected of being part of the Royal Family), the Crown Prince finds himself time travelling 300 years into the future and confronts considerable challenges as he adapts to 21st century Seoul and Park-ha. His modern era counterpart, Tae-yong, was left for dead by his cousin Tae-mu, after the latter pushed the former at the sea at the start of the episode. Lee Gak starts to impersonate as Tae-yong as he realizes that the Joseon era and the modern era holds similarities that will bring him closer to solve his wife's death. (Lee Gak in initial episodes wears a red tracksuit.)

Han Ji-min as Park-ha / Hong Bu-yong

Strong, resilient and having an optimistic personality, Park-ha has endured many hardships and trials since she was separated from her family at age 9. She has been looking out for herself ever since. She helps Lee Gak and his entourage to live in the modern era after they appeared at her home. Her Joseon era counterpart, Bu-yong, is shy, elegant and smart younger sister of the Crown Princess Hwa-yong who harbors strong feelings towards the Crown Prince. She was to be the supposed betrothed of Lee Gak, until her face was burned by Hwa-yong and thus the prospect of being the Crown Princess was passed to her older sister and forced herself to wear a face mask to hide the scar on her cheek.

Jeong Yu-mi as Hong Se-na / Hong Hwa-yong

Se-na is Park-ha's older stepsister. She works as the secretary at the company owned by Tae-yong and Tae-mu's grandmother. Ambitious, Evil, scheming, and hateful of Park-Ha, she has relied on Tae-mu in the past to advance herself. She is resentful of Park-ha and has made her sister's life difficult. As Hwa-yong, she is Lee Gak's wife, the Crown Princess, and Bu-yong's older sister.

Lee Tae-sung as Yong Tae-mu / Prince Muchang

Tae-yong's cousin and Se-na's secret lover. He holds a high position in the company and is not lacking in skills nor industry. Tae-yong's and Tae-mu's grandfather's had a transgression with another woman, which resulted in the birth of Tae-mu's father (an illegitimate child). Because there is no blood relation between Tae-yong's grandmother, who is also the CEO of the company, Tae-mu has always been sidestepped in favor of Tae-yong. Smart and ruthless, he resorts to whatever means necessary to get what he wants. His Joseon era counterpart (as revealed in the last episode), Prince Muchang, is Lee Gak's half-brother.

Lee Min-ho as Song Man-bo

One of Lee Gak's entourage. A child prodigy, he has become proficient in all fields of study by age 22. However, because he is an illegitimate child, he cannot sit for any government exams and thus, cannot take a position as officer. Because of the hopelessness of his future prospects, he has abandoned the study of the classics for an immoral lifestyle until Crown Prince Lee Gak enlisted his help to solve the Crown Princess' murder. (In the initial episodes, he wears the green tracksuit.)

Jung Suk-won as Woo Yong-sool

One of Lee Gak's entourage. He murdered the nobleman who killed his mother and raped his sister, as well as the nobleman's guard of about 15 others. He is very skilled with the sword. When later questioned by Lee Gak, he said that he learned to fight in order to protect the innocent, his nation and his king. His intentions are true and the Crown Prince saved him from the executioner's axe and appointed him as his personal bodyguard. (In the initial episodes, he wears the blue tracksuit.)

Choi Woo-shik as Do Chi-san

One of Lee Gak's entourage. Smooth with the ladies and skilled with men, Chi-san works at the largest brothel in Joseon. From the palace to the bedroom, Chi-san is wise in the ways of the world. Lee Gak appointed him as palace eunuch to discover what the people are saying about the Crown Princess' murder. (In the initial episodes, he wears the yellow tracksuit.)