What is the fine-grained topic of the following text: Convinced that good guys never win, he concocts a plan to hold the heiress Xiao Zhi (Park Shin Hye) ransom, but when Xiao Sa mistakingly saves her, he’s offered a rags-to-riches position as her butler. Only return the topic.
A man mistakenly saves a heiress and is offered a job as her butler