Thank you! We are currently trying to see all the remaining loopholes and filling them in with other endings so your comment comes right on point ^^
Yes, the ending where MC survives but Fujun died was originally the outcome of ending 4 (you poison him but he doesn't poison you). However, we changed it to what it is currently since we thought of Fujun feeling petty enough in his last moments to bring MC down with him too.
The addition of this outcome could work though if we split the case where Fujun dies of being fed the wrong dish from the case where he dies from the poison in his cup.
For word count reasons, we had to fuse these cases together into the same ending 4 unfortunately at the time. But extended would be free of these constraints, so definitely something worth to consider!