In order to survive, ordinary person Mu Yun binds the survival system to travel to the novel world, and his only mission is to survive.
Traveling through time and becoming a cold Immortal Lord... "The Immortal Lord is in trouble, the demons are attacking!"
Travel through time and become an elite captain... "Captain is in trouble, we are surrounded by zombies!"
There is no most tragedy, only more tragedy. Mu Yun: Damn, what kind of cruel things are these? !
(The protagonist grows up and becomes stronger later on.)