Vergil was corrupted because he wanted revenge when he was in the underworld. He saw the 3 eyes of Mundus and said "If my father could defeat Mundus, so can I." and he ran off...the rest is guess work. I think...Vergil was close to dying and Mundus said..."Join me and we can resurrect your parents." so he did and he was corrupted.

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We all have a past good, and bad, a million reasons to be sad, a million reason to feel bad, a million reasons to hate our dads, we know love's a game, so we feel such shame, and it's bloody rain, and I scream for you again....

I have felt a fear so intense that I scream, scream for mother, cry, cry for mercy, shed a tear, a tear of blood, wished, wished that you were real so I could be with you, be with you forever,just as I should be.
By me~

Think dark, smack light, don't be a jerk, KNOW HOW TO FIGHT!!