Kdrama adaptation: see you in my 19th life.

You, a person who can remember his past lives. You fell in love with your little friend.

In a car accident, you hugged him to protect him and as a result, you died. In your last seat you whispered to him "I will return to you", since he was unconscious he did not hear you.

In your current life, you found him and you don't know how to tell him that it's you. You're younger than him and Heeseung is already an adult. He grew up well.