The idea of using iron as a tool to restrain the spirit race is wonderful. There is no iron in nature, but human beings finally smelt iron under the drive of desire. What is the difference between the high heat of smelting and the flames of hell? Most of the things cast by iron are weapons, battleships, shackles, and cages, all of which are against the original natural nature of human beings as spirits. Ironically, destiny is self-made after all.
I also like the interpretation of true love. It has nothing to do with gender or blood, but comes from long-term selfless giving, purposeless intimacy dictated by nature.
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