Yonghwa is reportedly not the only CNBLUE member who participated in insider trading using FNC stock. 

According to prosecution, Yonghwa had used insider information to purchase 21,000 FNC shares at a low price to later sell them at a much inflated value. 

SEE ALSO: Brother of popular actress named as suspect in ex-girlfriend's death

Currently, prosecution is investigating 1~2 others for similar charges, and allegedly, one of them is another CNBLUE member. 

FNC had released a statement regarding this incident, saying, "It's hard to comment on a case that is currently being investigated outside the court of law. Once investigations are over, we will reveal any details."