Um no, U get it wrong. I'm Chinese so I know.
Madarine is not the same as Taiwainese. People in Taiwain speak Madarin and Taiwainese, depends on the individuals.
Cantonese only speak by Hong Kong people and ONLY HONG KONG PEOPLE.
China speak ONLY MADARIN. THEY DO NOT SPEAK TAIWAINESE, Taiwainese are only for Taiwain people.
And Part 3, won't be about Yue Ling kids. Why? Because Part 1 True Love by Vivian Chen is NOT RELATED to Part 2 which is about Mute Bride. So I doubt if Part 3 connected to The Mute Bride.