Casts:

Park Sun Young: Yoo Hye Chan

Hye-chan is a 29-year-old housewife. The plagued relationship with her husband, the "handsome king", spurs her to file for divorce. But on her way to court, she gets into a car accident, and when she wakes up she thinks she is 18. While physically she looks like a housewife in her late 20s, mentally she reverts to the age of 18. But as time goes by, she recovers her memory step by step.

Ryu Soo Young: Kang Sang Yeong

When his wife asks for a divorce out of the blue, he agrees to it because it hurts him a great deal. But finding that his wife has amnesia after the car accident, he makes every effort to help her recover her memory and mend their relationship. He is one of the most sought-after commercial film models and a famous entertainer.

Park Eun Hye: Shin Ji Yeong

A top-rated actress, Ji-yeong falls for Hye-chan's husband, Kang Sang-yeong, one-sidedly, while Hye-chan acts like an 18-year-old girl as a result of her amnesia.

Lee Jung Moon: Kim Nun

Nun is a high-school student who sincerely loves Hye-chan.

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One of my all-time fave Korean series is 18 vs. 29! I so love Hye Chan and Sang Yeong!! Woohoo!!~~ Park Sun Young is really perky and funny in this series and Ryu Soo Young is a major hottie! I also love it because Choi Si Won is here!