xuǎn yīgè zhēnshí dàn kěkòng de wèntí, zài shuō nǐ zěnme gǎi, fǎn'ér gèng kěxìn

选一个真实但可控的问题，再说你怎么改，反而更可信。

Choosing a real but controllable problem and then explaining how you improved actually makes it more credible.