Enter Attack on Titan with Breathwork

[No system + no Holy Mother + brain] Just after being killed by Yiwozuo, he came to this world and turned into an innocent giant. Wei Luo was devastated. I even thought about reopening. But when I came back to my senses, I realized that this was not the world before. The technology in this world didn't even exist during World War II. In an instant, Wei Luo's self-confidence exploded. The Giant of Hubei? Mine! Warhammer Titan? I want it too! Weird bug? Bring it all to you!