Valentine's Day, also known as Valentine's Day, is a national holiday in some countries in Europe, America and Oceania. There are many origins of this festival, but generally it is more common that Valentine, a Roman saint, was executed and later designated as "Valentine's Day".

In the 3rd century AD, the Roman Empire experienced a comprehensive crisis, with its economy in decline, the ruling class corrupt, social unrest, and people revolting. In order to maintain their rule, the aristocracy brutally suppressed the people and Christians. At that time, Valentine, a believer, was arrested and imprisoned. In prison, he impressed the warden's daughter with his frankness. They love each other and are cared for by the warden's daughter. The ruling class ordered his execution. Before his execution, he wrote a long suicide note to the warden's daughter, stating that he was innocent. It shows his upright heart and deep attachment to the warden's daughter.

On February 14, 270 AD, he was executed. Later, in order to commemorate Valentine's sacrifice for justice and pure love, Christians designated the day before his execution as "St. Valentine's Day". "Lun Festival", later generations changed it to "Valentine's Day".