While Filipinos can’t still come to Korea and teach English legally (F-2-1 visa holders are allowed to hold jobs but the immigration still forbids Philippine passport holders to teach English although some private schools are oblivious to this), they can always teach Koreans from the comfort of their homes through online teaching.
I’ve been asked several times by Filipino English teachers to help them find students for their online teaching. There’s a website popular among Korean students and Filipino teachers alike. It’s called ONTUE and it’s where teachers and students meet. I browsed through the job offers and I’d just say that the students are getting a bargain since private tutoring in Korea starts at 25,000 won an hour.
There is a list of teachers with videos and recorded messages. I think the site could be a good source to earn extra income for some just like a home business. Not for me, though I’m still trying to get a part-time job since I quit my hagwon job last week.