Xu Yigong, a loyal dog who is sensitive to lack of love × Zhi Sashou, a growth-impulsive type
What Zhi Sa fears most is drugs. What Xu Yi fears most is the consequences of taking drugs. The two met because of drugs and separated because of drugs.
Xu Yi didn't know that Zhi Sa was an undercover agent, and Zhi Sa didn't know that Xu Yi was an undercover agent. Zhi Sa illuminated Xu Yi's life, and Xu Yi grew up with Zhi Sa.
Purpose: Fighting drugs starts with everyone