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Hualian's red thread is a great symbol of Hua Cheng's love. It's reminiscent of the red thread of fate, but Hualian weren't exactly fated--actually quite the opposite, they were kept apart. By putting the red thread himself, Hua Cheng forces fate to never separate them again. It symbolizes all the hard work he's put in to search for and find Xie Lian. He literally creates his own fate, their own fate, with pure will, just like he doesn't pass away out of pure will. It's his love and immeasurable strength and will power.