She was your first love.but you hesitate to confess.so you didn't get the chance.After 10 years,you are 28 now.And you saw her with a ring,at midnight you went to a small bridge to think,but a bicycle crush unto you. Unfortunately you fell at the river. But when you woke up.It's back 10 years ago,you time traveled.And now your the homeroom guidance teacher of your past classmates,friends,yourself,and your first love.

You are standing in front of them to introduce yourself as the new teacher