Lin Yuan transmigrates from his original world, Blue Star, to a world where everyone has a balloon floating above their head. The balloon above Lin Yuan's head is bloodred, and it possesses a will of its own. It grants him greater power than other balloons, but it also does everything it can to kill him. Lin Yuan wants to kill it too. What's more, Lin Yuan's origins are far from ordinary. And so, he and the balloon form a very peculiar symbiotic relationship.
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