The World After the Bad Ending

When I transmigrated, the main character was already dead.
I had to protect the world after the bad ending.
So first, I became the enemy of the Main Heroine who was on the verge of su*cide.
“I now know what you meant by everything you said until now.”
“Its all your fault, junior, that I became like this. Take responsibility.”
“I can only sleep when I am next to you.”
… … But somehow, everyone is getting stranger