From Zhuangzi: The World of Man: "The Yellow Emperor wandered north of the Red River, climbed Mount Kunlun, then looked south as he returned and lost his Dark Pearl."
Just after Jiang Guining escaped her lecherous male supervisor, a passing stranger, Zhou Lin transferred her to his team.
"It's not as laid-back here as your old workplace. We work everyone like mules, men and women alike. But I can guarantee one thing: you won't be harassed by a male supervisor." Captain Zhou's expression was stern and his manner righteous. "Having improper designs on pretty girls is instinctive for male creatures. Humans can control themselves, beasts can't. But the difference between a human and a beast is only a thought away. I hope you'll learn to protect yourself too, and stay away from beasts like that."
Jiang Guining: "..."
Later, Jiang Guining asked curiously, "Captain Zhou, you said having improper designs on pretty girls is instinctive for male creatures. Do you have that instinct too?"
Zhou Lin glanced at her. "Tsk, Jiang Guining, you're a girl. What kind of outrageous stuff have you been learning?"
Jiang Guining: "..."
But weren't those outrageous words yours in the first place?!
Jiang Guining couldn't think of a comeback when Zhou Lin said, "I do."
Jiang Guining: "..."
Later still, Jiang Guining caught a certain Zhou's wandering hand and gave him a knowing smile. "You said I wouldn't be harassed by a male supervisor... Hmm?"
Captain Zhou still looked as righteous as ever.
"This isn't harassment between us."
"Hmm?"
"It's mutual affection."
A highly capable, combat-ready former covert operative who just wants to retire and tend the boiler at a funeral home
vs
A handsome police detective who was rejected by the covert service for being too good-looking and now just wants to enjoy a cozy family life with his wife and kids
"Lost Pearl" was the code name the heroine used on missions.
Theme: Descendants of Yan and Huang, defending our homeland. The people will never forget, and neither will the motherland.