As for availability, I couldn't find any information on whether "Riki-Oh: The Story of Ricky" is currently streaming on Filmyzilla or other online platforms. However, the movie may be available for purchase or rent on other streaming services or DVD/Blu-ray.

Here's a good report on the movie:

You're referring to "Riki-Oh: The Story of Ricky"!

The movie's influence can be seen in many subsequent Korean films and TV dramas, which have borrowed elements from its gritty and intense portrayal of urban crime. "Riki-Oh: The Story of Ricky" has also been referenced in various forms of media, including music and video games.

The story revolves around Ricky (played by Ahn Sung-ki), a young boy who becomes embroiled in a web of gang violence and crime in Seoul. After Ricky's father, a police officer, is killed, he seeks revenge against the gang responsible. The film's narrative jumps back and forth in time, revealing Ricky's troubled childhood and his eventual descent into a world of crime.

"Riki-Oh: The Story of Ricky" is a 1998 South Korean psychological thriller film directed by Kang Woo-suk. The movie is based on a comic book series of the same name by Kim Jin-hwan.