Korean Superstar Rain has answered the ALS Ice Bucket Challenge in a big way. Not only did he get super-drenched, he has become a rainmaker for ALS research by donating 100 million won (almost US$100,000) to a university hospital. He also named three other famous celebrities, including an American actress who still has a crush on him. And oh, lets not forget the video where he wears a thin white shirt.

It turns out that Rain's mentor suffers from ALS (Amyotrophic Lateral Sclerosis), a progressive neurodegenerative disease that affects nerve cells in the brain and the spinal cord. It is commonly known as Lou Gehrig's Disease for the famous American baseball player whose career was ended by the incurable disease.

Rain said in his video that participating in the ALS fundraising campaign carries a special meaning for him. He continued, "My father-like mentor, Hong Seung-sung, who led me to debut as a singer, has been suffering from the Lou Gehrig’s Disease for three years. I've always thought about how to return his love to express my gratitude." Hong is co-founder and CEO of Rain's agency, Cube Entertainment.

Aww... did they really have to pour ice water TWICE on him? Those tubs were large too. Rain handled it well, though.

I'm sure he didn't mean for his shirt to get so wet, but we fans are not going to complain about the thin white shirt that got really, really wet and almost transparent.

And guess who he nominated? Lee Byung Hun, PSY, and fangirl Megan Fox!

In the meantime, the ALS Ice Bucket Challenge has gone so viral in Korea that even the Wall Street Journal took notice. Rain's kind gesture in donating to ALS research to find new treatment for this debilitating disease is really commendable and sets a very positive example.

Thank you, Rain.

By the way, Rain and Krystal's new drama, My Lovable Girl will air starting September 17 after the conclusion of It's Okay, That's Love. You can sign up for new episode alerts HERE.