Conversation so far:
When was Kim Jae-joong's first solo album released?
His first full-length solo album, WWW was released on 29 October 2013.
Did the first album receive any rewards or recognition?
"Sunny Day" was released ahead of the album and topped the iTunes EP chart in Japan.

Question: How many solo albums has he released?
Self-contained rewrite: How many solo albums has Kim Jae-joong released?