Red strings symbolize love. Usually, a couple will wear the same one, with the man on the left and the woman on the right, like a token, called the "chain of love," representing the meaning of staying together forever. If a man ties a red string around a woman's left ankle, it signifies a lifetime of loyalty and devotion.
To ward off evil, during the zodiac year, people often wear a red string, as red represents a good omen, indicating safety and smoothness in everything, and carrying away bad luck. They usually wear red underpants or red belts. A girl tying a single red string around her left foot can ward off evil spirits. If she ties it around her right foot, it means she is expecting true love to appear, meaning she might be waiting for someone to accompany her for life. Elders say that tying a red string around the left foot helps avoid encountering ghosts or deities when walking at night.
Pillows, bed sheets, and blankets are items that are touched every day. It is not enough just to place a red thread under the pillow; using red-colored bedding is more effective for attracting romantic opportunities. Red has the meaning of auspiciousness for romance, similar to marriage, which is also mainly red. Therefore, the color of the bedding is lucky and can attract romantic opportunities. Placing a red thread under the pillow, with a length equal to or slightly longer than the pillow, can unconsciously bring more chances for romance.
Placing a red thread under the pillow is very effective for those who want to get married, bringing better romantic opportunities. However, for those already in a marriage, it is not advisable to place a red thread under the pillow, as it may affect marital harmony and easily lead to infidelity.