This was my project in 2nd year, it focused on the save system.
The background is based on the COVID-19 time in China, when people were restricted from going out. Your dog can only pee or poo outdoors, so you come up with an idea: sneak out to the park, collect leaves, and build a small "park" at home to simulate the outdoor environment. The park is patrolled by soldiers in white defence uniforms, but this is the only way to save your dog.