Will I need a transit visa?

Hi, I am doing a multi stop trip soon and my stops are below:

1. New Zealand to Singapore
2. Singapore to Hong Kong
3. Hong Kong to Shanghai (I will be applying for a visa for this entry)
4. Shanghai to Beijing (Travelling within the country, so therefore don't require another entry)
5. Beijing to Seoul
6. Seoul to Guangzhou (transit for 3 hours) - Will I need a transit visa for this?
7. Guangzhou to New Zealand

Will I need a transit visa for 6. Transit in Guangzhou for 3 hours?
Thanks,