How to get 150 corolla blue roses for new players to complete Siani story missions?

If you're new your are basically stuck buying them from the gift vendor. I do not recommend this because it'll take forever. Instead you should power through the story until you get to Chaos. There Chaos Loot Chests will drop frequently. This is probably the best way to get them.

It only takes 50 to complete now that it no longer gives them to you also

Mana aku belum dapat blue rose.nya?