Traveling Through the Tiga Universe? but I'm Just Human

(The protagonist can transform into Nexus and be active in different Ultra universes) This is a story from "spectator" to "guardian". An emergency doctor brought knowledge from his previous life and thought he was here to be a consultant, but due to the push of fate, he stepped into the front line. He armed himself with data and analysis, but lost his safe zone in the process of protecting others; he was afraid of being seen through, but was understood by the two most important people at the most critical moment. A loneliness burdened with "knowing everything but being unable to express it", A secret that carries the secret of "transforming into a giant of light but cannot reveal it to the public", A person who carries the responsibility of "seeing through everything but choosing to guard silently"—— These three people, a man, a young man, and a woman, came together from their respective loneliness and took off their disguises in front of each other. They protect silence with silence, respond to tacit understanding with tacit understanding, and support trust with trust. In the end, at the darkest moment of human existence, they each handed over their most precious things: Dagu handed over Diga's body, The children handed over the light of hope, And Qi Xuan - what he handed over was the last barrier held up by his life. This is not a story that steals the limelight. This is a story about keeping the door open for miracles. That silver-white giant, people don't know his name, don't know where he comes from, don't know why he comes. But they remember - When Diga fell, there was a silver light that blocked the darkest darkness for him. That's enough.