This blog to warn everyone, not just Seattle/Western Washington locals
"Ryu" Chiyong Roh based in the Greater Seattle Area, but he has moved in several of his victims from other states across the country to Washington state to start or continue their romantic relationships.
In reality, this was also in service of displacing them from their loved ones and support systems back home and further his proximity and control over their lives.
Even if you don't live Seattle, it's possible he still might to try to talk to you or someone you know anonymously online to get them into a relationship, sexually harass them or otherwise abuse them. It's also possible he might try continue to attempt to bring people to Washington to live with them.
Also I have seen people outside of the USA get abused and harassed by him online, so it's a good idea overall to protect each other and spread these posts and the word about him.
So anyone who lives in the USA can share these posts to prevent him from abusing and displacing more people and anyone who lives outside of the USA can still help spread the word to keep people on and offline safe.
He's probably not going to active online unless it's through anonymity nowadays since he has deleted most of his social media.