The only legal service is the employment system between China and South Korea, the only legal service. The rest can't be said to be illegal, but the price can't be considered legal. Because the national law stipulates that the fees charged for going abroad cannot exceed 5,000 yuan, all the expenses of the employment system (including visas, air tickets, health certificates, etc. ) There are only more than 4,900, which seems to be a difference of more than ten dollars. Employment system is a service of cooperation between Korean government and China government. How reliable do you think? At least you won't be cheated by the contract. You just had an accident in Korea. Anyway, your age is 18 to 39. I have something to tell you about the group. If you leave a message for the group owner, you will get an answer. He is more comprehensive than I said. Baidu is not omnipotent. There are some things to ask professionals.