Shelter No. 404

At the age of eighteen, Lin Huan collided head-on with the other side of the world. Behind a door can be a classroom or an abyss. A strange re-examination and a mysterious letter led him into the deep sea. Here, anomalies are contained, studied, and numbered. He struggled to escape when the containment failed, and he locked the gate when the sea water poured in... The contract of the field department is in front of me: a trainee investigator, with a monthly salary of 20,000 yuan and a fund of 500,000 yuan, at the cost of becoming a forever secret. They need ruthless tools, they need iron will, they need fearless courage, no choice, no pity, no hesitation. Losing value will lead to death. How will he get to the end?