Yeonam Park Jiwon, during his visit to Qing as a member of the emissaries, finds an old book labeled 'Memoirs of Park Dalhyang' in the stacks of the library at the Forbidden City. The protagonist of the book, Dalhyang, goes to Hanyang in order to ace the military officer exam and marry his first love Yunseo. There, he finds extraordinary masters of martial arts who call themselves the "Three Musketeers"...

Park Dalhyang's first encounter with the Three Musketeers in the unfamiliar city of Hanyang was a whirlwind! Thanks to Sohyeon's benevolent arrangement, Dalhyang barely passes the military officer exam. That's when his first love, Crown Princess Gang secretly comes to visit him. On another note, Seungpo and Minseo witnesses a surprising scene, while they gather at a bar to buy Dalhyang some congratulatory drinks...

Sohyeon, shocked by the return of Miryung whom he had thought passed away, orders the re-investigation of her death. Dalhyang, who finally gets to receive his official position after a series of troublesome events, attends the Bangbangeui with a full heart. There, he sees someone who was entirely unexpected...