Now, the same snow falls on the same upright shoulders.

The hands that brushed away the snow remained unchanged, but the person who took on this responsibility and weathered the storms of life has changed from the husband to the son.

“Officer Ji,” she withdrew her hand, her voice clear and steady, “I have long heard of the names of the twin stars of the police force.”

As soon as she finished speaking, Xia Tang turned to the side.

Another guard stepped forward from behind her, carrying a gleaming silver metal box with an incredibly precise structure and perfectly fitting locks.

"The reverse tracking scheme for the veterinary drug has been completed."

Xia Tang's gaze swept over the brother and sister, and without any further pleasantries, she cut straight to the point, "The next tracking operation will require your full cooperation."

"The Spring Festival is approaching."

"Let's find the reagents as soon as possible so that everyone can..."

She paused, her gaze lingering briefly on her children's faces.

Have a peaceful and happy New Year.

These words invigorated Xia Zhining, allowing her to suppress the turmoil in her heart.

Task. Reagent.

National scientific research achievement, but the dangerous Dr. Lin.

Xia Zhining blinked hard, forcing back her tears.

Now is not the time for tears; they are still on their mission.

If I complete this task... will I be able to celebrate the New Year with my mom?

This idea completely changed her entire state of mind.

He instantly switched from dependence on his biological mother upon reuniting with her to warrior-like focus.

"clear!"

Xia Zhining's voice was clear with a slight sob, but her eyes were incredibly firm.

"Mission accomplished!"

Ji Shuyun lowered his salute and silently stood beside his sister, like a silent and reliable shadow.

The warmth of reunion lasted only a moment before being overshadowed by heavier responsibilities and more urgent missions.

At this moment, they are first and foremost the shield and sword of the nation.

Then, there are the family members who have been separated from each other for many years.

At the junction of the snowfield and the forest, a temporary command center has been set up.

Xia Tang stood in front of the holographic topographic map, her fingertip hovering over the surface, her voice clear as an icicle falling to the ground:

"The next step is to widely disperse tracking agents for marking."

She pulled up a dynamic molecular structure diagram, on which the simulated reaction process of the tracking agent and the animal repellent was clearly displayed.

"After the tracking agent specifically binds to the target residual animal repellent, it will produce a completely new volatile molecule."

"It is completely harmless to animals and emits a mild scent that attracts small animals."

"The scent is like a mixture of ripe berries and fresh pine resin, which is very attractive to most birds and some small mammals."

“So,” Xia Zhining immediately understood, “once the tracking agent and the residual animal repellent react, that area will naturally become the focus of animal activity.”

"That's right."

Xia Tang nodded. "We will use this to convert the invisible chemical markers into biological signals, which will allow us to find Professor Lin Maoyuan's whereabouts."

Upon receiving the order, several medium-sized drones from the military and police quickly took off.

Like a silent swarm of bees, following a pre-set fan-shaped grid route, they began to evenly scatter pale purple tracking agent powder over the vast snowfields and forests.

Under the sunlight, the powder, like extremely fine ice crystals, silently blends into the vast天地 (heaven and earth).