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An online show following the members of Seventeen through their journey as an idol.

A handsome surgeon tries to make up for his biggest regret. When he earns the chance to go back in time to his senior year of high school, he strives to overcome his cowardice to help his classmate Han Fei and prevent an impending tragedy. Ever since Han Fei unintentionally helped Wu Jing Hao out of a sticky situation in school, she has never left his line of sight. Wu Jinghao begins to notice everything about Han Fei, that she is often distracted in class and impossible to get close to as if she had spikes like a hedgehog. Wu Jinghao eventually learns that Han Fei once took her friend to eat barbecue, yet an accident resulted in her friend being burned and falling into a coma. Han Fei has lived in guilt since then. Wu Haojing patiently stays by as he encourages her to step out from the shadows

In 1976 on a remote island, school teacher Eun-young wants to take her students on a field trip to a cookie factory in Seoul. Even though the parents don't like the idea, Eun-young succeeds in convicing them. But once they arrive in the complicated city, some students become fascinated with high-tech bicycles and get lost.