Drama officials confirmed that Choi Soo Young decided to appear in the said drama. So both the actors, Choi Soo Young and Jang Geun Suk are the main characters of ‘Unexpected Country Diary’.
‘Unexpected Country Diary’ is the story about a veterinarian thrown into a rural village and meets a police officer. The veterinarian then gradually gets used to country life. Choi Soo Young plays the role of the police officer Ahn Ja Young while Jang Geun Suk portrays the role of the veterinarian Han Ji Yul.
Source(1)