Tree of Savior players are being invited to a special event that asks them to become Cherry Blossom Heroes. During the event, players will descend into Vubbes' Lair to retrieve Cherry Blossom Cubes in order to stop those who want to steal spring.
The event can be completed two times a day by players level 70 and above from April 11th to April 25th with a number of cool items dropped along the way.
You can check out the "how-to" guide on the Tree of Savior site.