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At a difficult place in his marriage and career, a middle-aged man gets a shot at a do-over when he's transformed back into his 18-year-old body.

Hae-na who is bound to inherit her family curse which is turning into a dog after getting her first kiss. The only way to break the curse is to get a second kiss. The problem is the guy who gave Hae-na her first kiss is afraid of dogs.

The ups and downs of school, family and growing up test the affection between a budding artist and her handsome but indifferent classmate and neighbor.

Love is as tough as it is sweet for a lovestruck teenager, whose relationship with her next-door neighbor transforms as they grow into adulthood.

When Jo Gang-Ja attended high school, she was notorious for fighting. She gave birth to her daughter A-Ran in her late teens and became more responsible. Her daughter A-Ran is now a high school student, but A-Ran is bullied at school. Jo Gang-Ja decides to go back to high school to protect her daughter. Jo Gang-Ja becomes a high school student again.