The reason why we need a Shu family to practice the Nine Rules of Ecstasy is that we need a Shu family to condense a soul seed in our own body, and then introduce it into Tang Yu's body through the soul seed, so that Tang Yu can practice.
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The reason why we need a Shu family to practice the Nine Rules of Ecstasy is that we need a Shu family to condense a soul seed in our own body, and then introduce it into Tang Yu's body through the soul seed, so that Tang Yu can practice.
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