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Social animal Cheng Baodao has been secretly in love with high school idol Gu Suiran for 8 years. She has low self-esteem and social fear, so she mustered up the courage to agree to meet him at the corner book cafe in the 9th year, but she has been waiting for 6 years. Cheng Baidao escaped from marriage and died in a car accident. When she returned to high school, she vowed to catch up with Gu Suiran and make up for the biggest regret in her life. She tried her best to do so. She was afraid of low self-esteem in the past and gradually became cheerful and enthusiastic. She made friends, chased male idols, and enjoyed her youth. She started a new life, and she slowly discovered that there was a hidden secret behind the wishful thinking she had always thought...

The story mainly takes place during the Republic of China. The protagonist is a rich young man who likes to live in a colorful world, and he even likes to be a detective...

What is shown is a competition of wisdom in the era of cold weapons.