Quarks

Previously I played as a Rune Knight. I made my Rune Knight as my booster character. Yesterday, I deleted my Rune Knight character and I totally forgot about my booster character event !!! (Really regret it) Is there any possible way to me to do a booster character again? I really want that reward (booster coin and equipment) from booster event. Hopefully anyone can help me? I feel demotivate right now to play Ragnarok Online because of this. Thanks.