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The seven days were coming up quickly, and Gu Fan's plan was to personally travel to ancient times, find Lin Xi, and then bring her back.
But this plan was risky, and there was a chance Gu Fan could get lost in ancient times as well, so Su Hui and Gu Ling opposed it. However, Gu Fan was adamant, having long determined that Lin Xi was his wife, believing it his duty as a man to protect his woman.
Seeing his determination, Su Hui and Gu Ling knew they couldn't stop him and only hoped that Gu Fan would be careful in his actions. Su Hui even wanted to accompany Gu Fan to ancient times.
But Gu Fan refused Su Hui's kind offer for two simple reasons. First, adding another person would require more time for preparations, perhaps even significantly more, and second, Su Hui needed to help Gu Fan guard the space-time door, to avoid the scenario where after finding Lin Xi, they'd find the space-time door no longer open for them.