The red string of fate, also referred to as the red thread of destiny, red thread of fate, and other variants, is an East Asian belief originating from Chinese legend and is also used in Japanese legend. According to this myth, the gods tie a red cord around the ankles of those that are to meet one another in a certain situation or help each other in a certain way. Often, in Japanese culture, it is thought to be tied around the little finger. According to Chinese legend, the deity in charge of "the red thread" is believed to be Yuè Xià Lǎo, the old lunar matchmaker god who is also in charge of marriages.
The two people connected by the red thread are destined lovers, regardless of time, place, or circumstances. This magical cord may stretch or tangle, but never break. This myth is similar to the Western concept of soulmates or a destined flame.