Be careful not to confuse it with the 2008 movie also titled "Sunny" ( My Dear is Far Away ), which is a war drama set during the Vietnam War. Sunny (2011) - IMDb
The story follows , a housewife in her 40s who feels invisible and unsatisfied with her mundane life. A chance encounter at a hospital leads her to Chun-hwa , the leader of her high school friend group, who is now terminally ill. Chun-hwa’s last wish is to reunite the "Sunny" group—a septet of girls who ruled the school with a mix of charisma, loyalty, and occasional delinquency.
The Korean Blu-ray release of Sunny includes English subtitles. You can find these on eBay or YesAsia. The physical copy is the only way to guarantee you will never lose access to the film due to licensing changes.
And those tears? They have no language barrier.