My bathroom connects to another world

What's the most important thing upon arriving in an alternate world? Zhao Guang believed that the first issue to address was how to keep oneself warm. Even more pressing, he had to navigate a world where his only connection to home is his own bathroom, acting as a bizarre portal between realities.

As Zhao Guang struggles to survive in a harsh environment, others discover the secret of his travel method. However, they soon realize that mimicking his portal-hopping technique requires a level of dignity-shattering commitment that they weren't quite prepared for.