There are 2 flowers to collect, beat the boss, it will trigger the rest of the quest
ohhhh ok! thank you ^^
Maybe i miss a thing, but the 2nd flower is blocked by rock T_T
They are tied with the day/night cycle of that dungeon. 1 unlocks during day, the other during night. Alternatively, there is an item (one of the boots) that lets you pass through walls
ohhh i see now! thanks you