I Transmigrated Into This Hell-like Heaven

Kristina got reincarnated into the body of a man after her stepfamily blamed her for her mother's death and eventually drove her to her death. Kristina could start over in the body of Alec's friend, Tristan. However, she couldn't forgive or forget their mistreatment.

How will Kristina deal with living in the male body?

What would happen if someone found out that Tristan wasn't himself anymore?

And most importantly, who is now in her body?