Ji Tang, 19, and Shen Zhao, 20, are the youngest outstanding students at the police academy. Due to their outstanding abilities, they were selected into a top-secret undercover mission - to infiltrate the transnational criminal group "Viper".
Ji Tang is good at chemical analysis and micro-expression interpretation, and infiltrates as a genius poison maker; Shen Zhao has excellent memory and extraordinary skills, and becomes the personal bodyguard of the drug lord's henchman. In the dangerous drug den, they are the most tacit partners, but they must pretend to be strangers.
In the life and death tests again and again, they used Morse code to convey information, used cartridge rings to remember their faith, and used dried Burmese gardenias to commemorate the feelings that could not be expressed in words. However, when the mission entered the final stage, an accident exposed Shen Zhao's identity. In order to protect more people's lives, Ji Tang had to make the most difficult choice...
"We agreed to go back together."
"But in the end, she stopped at 19 years old forever, and he stopped at 20 years old forever."
Purpose: Anti-narcotics police