Im-sol is an ordinary student who is about to graduate from college. Hiding the fact that she is a fan of Ryu Seonjae, the fifth member of the Idol group "Kamjajeon", she is living an empty life. Ryu Seonjae, a member of the Idol group "Kamjajeon", is dead! Then one day, because of an accident, Ryu Seonjae died and Im-Sol, who washing her sorrow away with a pack of soju, accidentally picked up a pocket watch and made a time leap to the past, six years ago... Gray pants, white shirt, beige knit vest. No matter how much she blinked and squinted at him, he was standing alive, right before her. “Seonjae, that’s Seonjae. Ah, it’s him. He’s real.” Ryu Seon-jae, a high school student who she only saw in the picture, was right in front of her eyes. "Ryu Seonjaeee! I really love you a lot!!" Eighteen to live again, with only one goal. It is to save Ryu Seon-jae! Im-sol’s struggling ordeal, ‘The Best of Tomorrow.’

대학 졸업을 앞두고 있는 평범한 취준생 임솔.
아이돌 그룹 ‘감자전’ 제5의 멤버 류선재의 덕후로서 텅장인 삶을 살고 있는데…

<속보> 아이돌 그룹 ‘감자전’의 멤버 류선재, 사망!

최애의 갑작스러운 죽음에 팩소주로 슬픔을 지우던 어느 날,
우연히 줍게 된 회중시계로 6년 전 과거로 타임리프 하게 되는데!

회색 바지에 흰 셔츠, 베이지색 니트 조끼.
사진으로만 봤던 고등학생 류선재가 지금 눈앞에 있다.

“류선재애애애, 진짜 존나게 사랑한다!!”

다시 살게 된 열여덟, 목표는 단 하나.
류선재를 살리는 것!

최애를 살리기 위해 고군분투하는 임솔의 수난기, <내일의 으뜸>