Dimensional Apostle

Lin Mu suddenly woke up to find himself in an unfamiliar place which had three suns hanging up in the sky. The architecture was different from the one on Earth, and the locals spoke a language he was unfamiliar with, but he could still somehow understand the meaning behind their words.
As he was in the middle of observing his situation, he suddenly heard a voice in his head. “Ding! The system authorisation has been completed. Newcomer’s guidance has begun!”
The world he was in right now was called Dimensional Main City, and it was the starting point for Lin Mu to travel to different worlds. The system will assign missions for him to complete, and he can’t go back home until he completes them first. Lin Mu quickly finds himself in a desperate situation because the price of failure for his first mission is... Death.