There is a high-speed train from Yancheng to Shantou, but it is not Shantou Station. If you come to Shantou, you can get off the high-speed train at Chaoshan Station, and then take the bus to Shantou at the ticket offices of those stations in high-speed railway station. The specific place to go is written in the ticket office. Generally, this ticket is 18 yuan. It won't be that expensive.