The number "520" as a metaphor of "I love you" originated from a song named "Digital Love" sung by Mavis Fan, a singer in Taiwan Province, China. With the spread of this song, these three numbers are endowed with the meaning of love. Later, an online song by China musician Wu Yulong closely linked "I love you" and "online dating"? .
So there is the current "520 Network Valentine's Day". Because of this festival, many people now choose to express their secret love to the person they like, or register their marriage with the person they like, so 520 online Valentine's Day is also called "confession day" and "wedding day".