How did Rhyu Si-min accumulate his wealth?

He used to live in the Hwajeong district of Deogyang-gu, Goyang-si,
but then he bought a villa in Bangbae-dong and moved in.
Where did that money come from?
Right now, a lot of suspicions are being raised
regarding his connection to SillaJen.
Instead of hiding,
shouldn't you come out and explain yourself?