Park Seon-young and Ryoo Su-young have been selected as the leads in the new KBS TV2 miniseries `Eighteen Vs. Twenty-Nine,` to premiere March 7 following `Sassy Girl Chun-hyang.` The new drama is based on the internet novel `The 4321 Days We Shared,` a heart-wrenching story about coming to terms with reality.  The main characters are 29-year-old Yoo Hye-chan (played by Park) and her husband Kang Sang-young (played by Ryoo).

The story begins with Hye-chan getting into a car accident and mentally reverting to an 18-year-old girl when she suffers from retrograde amnesia. In the story, the character Kang Sang-young, who is the same age with Hye-chan and who married her after 10 years of dating, is a top-rated entertainer in Korea.