Well... Experimenting and trying to find something new, I found a cheat code, or rather, Ai Deepseek. It said that if you press B UP UP UP B LEFT LEFT LEFT, then the player will immediately teleport to the city where we have to get rid of Ralsei and Susie. I decided to use this cheat code when I was here.
after that, as expected, I appeared in the city, but with one caveat... There was a final boss but red!

He was shooting green projectiles that can't do anything to the player. But at the same time, he can attack player with his body. What's even more strange is that the player can't beat him in any way. Even if you have lv 3. If you go further along the plot, in the sewers, everything will seem normal at first, until you move over.
Yes... There will be a second Kris without a head. And it can even be killed.

And yes, as we go further, we will meet this boss again! The only difference is that he has a blue tongue and not a red one. And he has first-phase attacks.
I'm just shocked that you can endlessly search for bugs like this, and it becomes fun that you can still discover XD
Changed: GUYS, I'VE BEEN DOING THE WRONG CODE ALL THE TIME! I was doing B UP UP UP B RIGHT RIGHT RIGHT all the time! If you make the code that I described above, the player will teleport to the ice castle.