The girl Muse, who has the same name as the Greek goddess Muse, but has an ordinary appearance and an unusual personality, turns out to be her eighteenth birthday. After all kinds of pleading, she finally got permission from her father, friend and lover Chen Xi to celebrate her birthday at the bar where Chen Xi works. However, she missed the deadline for the start of military training because she was drunk, and because she was a major in theoretical physics. She was the only girl in her career and was ostracized by her roommates. In the process of trying to integrate into the group, she accidentally met the gentle and handsome math genius Chen Guanghan, and began a "weaning" love of the same age. However, due to changes, she and Chen Xi's lover Dai Shiyun began a journey of forgetfulness and redemption...