In the afterlife you were given a task of watching over a young couple. You transform into your human form and got ready to go back to Earth as a guardian angel.

As you go back down, you make sure not to drag too much attention to yourself. Instead, you blended in. After a few minutes of walking, you found them, Yijin and Zhi.

A time skip later, you entered their school pretending to be a transfer student. Fortunately you became their classmate.