Rooftop Prince

The story opens up in the Joseon era when the crown prince (Yoochun) is looking for his wife. Then, they go to the past and show the main characters younger selves in both times (Joseon era and modern times). This episode does a lot of switching between the Joseon era and Seoul (modern times). Mysteries and schemes happen in both times. The "Joseon Four" gather. The Crown Prince and his men time travel to the modern days.

The Crown Prince and his men don't understand how they wound up at Park Ha's house and think things will be okay if they go to the palace. After dropping them off she leaves, and the Prince and his men get sent away by cops and they look for food. Eventually put in jail and were told that they'd be let out if they provided contact information. Remembering Park Ha's license plate they return to her and after breaking things in her apartment she's making them work to pay her back.

The Joseon 4 create more chaos wherever they go. Tae Mu and Se Na keep being their scheming selves. Park Ha teaches them to read and tries to teach manners to Yi Gak. He meets with the "grandma" upon her request. Yi Gak sees Se Na.

Lee Gak is thrown out of the building. Meanwhile, Park Ha's business location falls through and her business fails before it even begins. The boys help her make some money. Tae Moo proposes to Se Na. Tae Moo hits Lee Gak and he falls into the sea. He is taken to the hospital, but when he wakes he seems to be another person.

Lee Gak's real plan is revealed. Park Ha gives in and decides to please Se Na. Tak Moo wants Lee Gak to get a DNA test. Lee Gak wants the grandmother to buy the rooftop house and she says she will, but gives him a condition. Lee Gak runs after Park Ha.

Park Ha sees the boys and smiles and since they will be working in Tae Yong's family company, they get a crash course from her including the complicated hyung-noona-dongsaeng relations. A new worker is called in by the grandmother. Park Ha has a few misunderstandings because of Lee Gak's questions. Someone from the past comes and the presence of a "birth secret" is revealed. An incident happens which makes Park Ha regain her memory. Park Ha and Se Na meet. Park Ha walks out on Lee Gak.

Park Ha has regained her memories and knows just exactly what Se Na did to her. Finding out that the one that Lee Gak is in love with is Se Na and not her makes her more upset. Secrets begin to get revealed as President Jang shows up and wants to see her daughter who turns out to be Se Na. Later on, she admits to having another daughter she abandoned and wants to find. She hands over a picture to Tae Mu to look for her - the same picture that was given to Park Ha by her stepmother.

The Real Identity of Prince Being Exposed

Lee-Kak tells grandma that Park-Ha is innocent. He gives Sae-Na THE handkerchief to trigger her memory. Park-Ha is ordered to wash the handkerchief, which she throws angrily missing the basket, after discovered by Sae-Na who takes it away. Park-Ha searches for it all night. She falls ill, Lee-Kak takes care of her. Sae-Na?s secret is discovered by Tae-Mu?s father. She sees the Lee-Kak?s note for Park-Ha, goes to meet him and tells him she likes him and kisses him, all witnessed by Park-Ha.

Park-Ha is told that Sae-Na is the crown princess whom Lee-Kak has to meet. Sae-Na thinks Park-Ha told Tae-Mu's dad about mother and confronts her threatening to take away everything from her, she is kicked out of the apartment and goes to her mother's house. She wants to prepare barbecue for the rooftop posse. Park-Ha leaves the house for the day and Lee-Kak goes to find her. She accidentally sends him a message confessing her feelings for him.

Lee Kak tells Bak Ha not to like him. TaeYong's phone is found and LK sees the photos of TY and TaeMu. He tells BH TY didn't meet her,cause he died. He confronts TM,and tells him he knows he's lying. At last he tells BH all the truth and reveals he wants to recreate the events of the night the Queen died,that's why he has to marry SaeNa. SN meets him and tells him she wants to marry him. A fire starts and BK is inside, LK leaves the meeting and comes running to save her.

Prince Lee Gak is given a second chance after failing to secure a contract agreement. Tae Moo discover's Se Na's family secret.

Tae Mu finds out that the real Tae Yong is still alive. Lee Gak is going to give a house contract to Pak Ha and Sena finds out, she exchanges the document with the plane ticket to US and Pak Ha misunderstands Lee Gak's intentions and leaves heartbroken. Lee Gak end up finding where she went (thanx to Manbo) and all the misunderstandings are cleared. Lee Gak finally sees through Sena .

Lee Gak finds out about Park Ha and SeNa being sisters and SeNa's relationship with Tae Mu. He confronts her and breaks the engagement. Tae Mu is still holding his Joker card (i.e the real Tae Yong's pics) so he can destroy Lee Gak at anytime. Lee Gak looses his "His Highness" influence on the trio. CEO Jang plays along with Sena and Tae Mu to know why they are deceiving her. Lee Gak realizes that Park Ha is his sister-in-law in Joseon!

Lee Gak tells Bak Ha she is the reincarnation of Bu Yong from Joseon. Bak Ha realizes he is flickering away and desperately embraces him the second he reappears again. CEO Jang discovers that SeNa and TaeMu are using her to get her vote in the CEO selection. BakHa discovers SeNa's lie and confronts her. TaeMu has Tae Yong flown in from Chicago. The Joseon trio get Tae Yong to safety. Lee Gak impersonates Tae Yong yet again and 'wakes up' while TaeMu is on air via live video at the Board meeting.

Lee Gak pretends to be Tae Yong, even mimicking his speech this time and Park Ha thinks the four guys have gone back to Joseon. SeNa overhears a conversation and believes CEO Jang has found the daughter she was looking for. While Lee Gak is finding more clues about what happened in New York two years ago, Tae Moo kidnaps Park Ha.

Park Ha finds out she's CEO Jang's other daughter. Tae Yong's grandmother falls down the stairs and dies.

Tae Moo does everything he can to make Lee Gak the suspect of the grandmother's murderer, so the inheritance passes to him.

Park Ha gets hit by the car. As consequence of the hit, her liver is damaged and the only one who can save her is Se Na. Tae Moo gets arrested while trying to leave the country. After the operation, Se Na turns herself in. The boys start to return to Joseon, but before Lee Gak vanishes he performs a symbolic marriage ceremony with Park Ha.

Lee Gak is back in Joseon and gets closer to finding the truth behind the Crown Princess' murder.