i should have posted it more earlier, cause a lot of people doesn't understand how this minigame works. Well, i spend a time trying to figure out it and i'll share what i knew with you.
The miracle theater is a minigame in Irene, so you need to be level 90 and do the quest to gain access to there. The minigame consist in a theater play where the players are the actors. You can play as the king of the elves, the princess or the traveler, it change nothing in the reward.
For play this minigame you need to be using the Mask of the Wandering Actor, that can be found in your wardrobe.
All act can contribue or not with a score that will increase the reward if you are doing the daily quest "
Great Ball: Play". For score, you need to choose a Remark with the same or part of the color of the remark chosed before by other player. If you are not with the all three actor, the game will put a bot to substitue the missing actor,
but all the remarks that the bot do doesn't count for the score
For example, if the actor before you choose a remark of color red, you need to choose another remark of color red or half red to score. You didn't need to stack all three buffs with 10 to get the high reward (some people belive in that).
After the play finishied you receive an skill to
Bow to the audience, it allow you to increase your score (and your reward).
tip: try zoom in the camera if the dialogs are covering the remark of the other actors (or keep atention in the buff that increase to chose a remark that share color).