Gong Woo-Jin is a 30-year-old single man and he works as a set designer. Due to a trauma he experienced 13 years ago, he does not want to have a relationship with others. When Woo Seo-Ri was 17, she fell into a coma. 13 years later, she wakes up from her coma. Her mental age is still that of a 17-year-old, but she is now 30-years-old. Gong Woo-Jin and Woo Seo-Ri get involved with each other and fall in love.

Yang Se-jong
Gong Woo-Jin

Shin Hae-sun
Woo Seo-Ri

Ahn Hyo-seop
Yoo Chan

Ye Ji-won
Jennifer

Wang Ji-won
Kim Tae-Rin

Jung Yoo-jin
Kang Hee-Soo

Yoon Sun-woo
Kim Hyeong-Tae

Sieun
Woo Seo-Ri (young)

Yoon Chan-young
Gong Woo-Jin (young)
After waking from a 13-year coma, a woman adjusts to life as a 30-year-old -- and reconnects with a man who blames himself for what happened to her.
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