You get the bad end in the passageway if you don't have a high enough romance stat with any of the characters, I'm pretty sure, so you probably just have to pick more romantic options during the first few chapters
Oh that reminds me
When The MC was at the Red Lantern, there were a few options that said that I wasn't close enough to X to choose them.
in the end, that must have lead to the bad ending(And it's proof that I'm way too shy to be ~romantical~)
Anyways thx for the tip. I defs feel way less depressed than I did when I got the ending (Being the player that always wimps out and takes the safe way).