What is a "Duan Yanqing" twist? It's when a character has been focused on achieving an objective for a long time, possibly his entire life, and we all know that is the case. Then one day, something random happens to him, and suddenly we're told that he loves this thing even more than his life-long objective.
Why don't we have some fun (or randomness) with this.
For example, take Chen Jialuo. We know his life objective was to overthrow the Qing throne and restore the Han rule. Then, suddenly, one day, he sees a cat being beaten on the street. He was outraged by the animal cruelty, and decided to dedicate the rest of his life to advocating animal rights instead. In the year 1773, he founded the world's first animal rights advocacy group called BHDW (Bao Hu Dong Wu). One of his followers was a foreigner named Alexander Garfield, who later spread the love for animals across the globe. 200 years and 9 generations later, Garfield's descendant Ingrid Newkirk founded the nonprofit People for the Ethical Treatment of Animals, aka PETA.