Network Valentine's Day is a love festival in the information age, celebrated annually on May 20th and 21st. The festival originated from the metaphor of "520" as "I love you" in singer Fan Xiaoxuan's "Digital Love" and the close connection between "I love you" and "online lover" in musician Wu Yulong's online songs. Later on, "521" was gradually given the meaning of "I am willing, I love you" by couples. Online Valentine's Day "is also known as" Wedding Day "," White Day "," Spoiler's Day ", and" Love Day ".

In this trendy, youthful, spiritual, and implicit festival, "520 (521) 1314 I love you (I am willing) for a lifetime" is its classic digital quote, and Wu Yulong's "Online Lover" is the theme song of the festival. People boldly say (show) love through (mobile phone, traditional PC) Internet (WeChat, QQ, microblog, forum, etc. as platforms) or mobile phone text messages, and even send gifts (red envelopes) to convey love and find love on blind dates. There are also countless couples gathering to register for marriage and hold a grand wedding banquet. Many businesses also take the opportunity to carry out group buying, discounts and other promotional activities, which has set off a wave of holiday fever online and offline.

With the increasing number of festival participants, various media (newspapers, television, the Internet, etc.) are competing to report the grand events of 520 and 521 "Internet Valentine's Day", "Daying", and "Pettish Day".