If I remember correctly, the note in the wall is relevant. I'm gonna write the right password below, so beware of a spoiler.
SPOILER:
The code is RELEASE ME.
I did find that one, but that one's for the bedroom door in Halo's house. The code I'm trying to find is the 4 number one for the door in Li's house
aaahh, turn the word hell around and you've got the number
