Following�Yoochun's unexpected marriage news, fellow JYJ member Jaejoong posted a big fat 'NO' on his Instagram. This led to rumors about Jaejoong being upset about Yoochun's marriage.�

On April 14, an insider who claimed to be close with Jaejoong explained his reactions to Ilgan�Sports. The insider explained that Jaejoong was having a meal with his family when the news broke out. Yoochun's marriage news was not informed to the agency, as well as the members of JYJ ahead of time. This brought frustration to Jaejoong, causing him to post the 'NO' on Instagram.�

SEE ALSO: JYJ's Jaejoong posts 'NO' on social media after news of Yoochun's marriage

However, the insider stated that this does not mean there's trouble among the JYJ members. The insider explained that the members do not meet often but still frequently contact one another.�It's also reported that the members stood by Yoochun's side during the sexual assault controversy.�

Jaejoong's reaction with the 'NO' is more out of shock than anything else. It's reported that the JYJ members highly respect one another's love life and do not interfere with them. However, Yoochun's news was about marriage and not about dating. The insider said, "He (Jaejoong) seemed very startled but I'm sure they'll work it out well after taking the time to talk."

The insider also added, "Based on the social media post, I don't think they were able to communicate well. But I don't think he had any ill intentions. I think he was more worried (than upset)."

Meanwhile, Yoochun and his fiance Hwang Hana�confirmed their wedding date for September 10.�