I'm not sure. It depends on the specific context of what 'Blow' refers to. If it's a movie or a book, you'd need to look into its background and the author's or filmmaker's statements.
It's hard to say for sure. 'Blow' could be a complete work of fiction or have some roots in reality that have been significantly transformed in the storytelling process.
I recommend a healing novel to you, and that is Mu Yan. It is a fantasy romance novel about ancient mythology. A heart-wrenching love, with laughter and tears, no regrets even if they loved to the point of breaking into pieces! This book gave people a feeling of sadness and happiness, and their mood would be healed. I hope you like my recommendation.
The 'blow hot blow cold' story often refers to someone who is inconsistent in their attitude or behavior. For example, a person might be very enthusiastic about a project one day and then completely cold towards it the next. It's like the fable where a man blows on his hands to warm them and then blows on his soup to cool it, showing his changeable nature.