A Heart Pounding First Love!

The following content is intended for mature audiences and may contain sexual themes, gore, violence and/or strong language. Discretion is advised.

Cha Tae-joo – He falls in love with Dayul after playing the role of her boyfriend when she was still immature and carefree. By the time he realizes his feelings, he has already left for the United States. Years later, he returns to Korea and reunites with Dayul, hoping for another chance to become her boyfriend.
One day, after a company dinner, he takes a drunk Dayul home and hears something strange.
“Erectile dysfunction? Me?”
He’s bewildered when Dayul suddenly grabs the front of his pants and cries, promising to cure him. How on earth did she come to such a ridiculous misunderstanding?
But wait… Could this actually be an opportunity?
Lee Dayul – Always cheerful and carefree, Dayul has an easygoing personality by nature. Now a jaded office worker, she longs for her carefree days as a twenty-year-old.
Because of her first love and first boyfriend(?)—her older brother’s friend, Cha Tae-joo—her standards have become impossibly high, leaving her unable to date anyone else. Her desires are through the roof, but with no one to satisfy them, she’s left feeling lonely.
After fate brings her back together with her first love seven years later, she discovers his shocking secret.
Her older brother has erectile dysfunction…?
Why on earth? How is that even possible?