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Edward fell silent for a long time after hearing this, and finally said, " ... You're right. Thank you. Just by listening to you, my mood has improved a lot. I just wanted to do something that only God could do, and it's fine that I didn't succeed."

"But I still want to do it."

He continued, "Even if only God can do it, we can continue to try to understand, and even if we don't succeed, any progress is good."

Zhao Yi shook his head with a smile, "You are really a stubborn person."

"Every physicist is stubborn," Edward said indifferently, "This is the excellent quality of pursuing truth."

"Of course."

Edward's mood improved somewhat, and he continued to discuss his ideas. His goal was to develop M Theory, or String Theory, towards reality, but he could not avoid the issues of multidimensional space and supersymmetry.

These were two fundamental obstacles.