At the Wu Wang Tower you have a brief moment, while she is downstairs, to hack Ms. Xu Enling's computer.
Laetitia said she leaves hints on post-it notes.
This is the low-spoiler guide for "Foot through the door" puzzle in Chinatown Detective Agency. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.