Since the Catholic Church reform of 1983, one miracle must be believed to have taken place through the intercession of the person to be beatified, though the medical investigations of the Church are privately conducted and therefore subject to speculation about their methods.
The requirement of a miracle is not relevant to the canonization of those who died in martyrdom, as their sanctity is evidenced by being killed in odium fidei (in hatred of the faith).
The feast day for a Blessed person is not universal, but is celebrated only in regions where the person receives particular veneration." Wikipedia
Watch clip below
www.youtube.com/embed/AdR-CkrUM0o
"It was one of the most anticipated events of the Pope's trip to South Korea: 124 martyrs were declared blesseds by Pope Francis, as the crowds cheered on.
More than 1million people filled the streets of Seoul to attend the Mass and beatification of Paul Yun-Ji-Chung and another 123 martyrs who were killed during the height of the country's religious persecution in the 18th and 19th century.
Catholicism was introduced in the country by the laity. The Pope talked about the martyrs life example." RomeReports
For the living know that they shall die:
but the dead know not any thing,
Ecclesiastes 9:5