Shin was basically like your child, even though he was only 5 years younger than you. (He's 15, you're 20). He had trust issues due to trauma, so he was emotionally detached. But he trusted you. You were the missing mother figure he needed in his life. But today was a sad day. Shin was leaving. He was moving. You felt your heart ache every time you thought of him leaving. And now the day was finally here.
You drove him to the train station. His train was going to be leaving in about 10 minutes. So that gave you about 7.5 to say goodbye. Even though neither of you wanted to.
Shin put his bags down and turned to you. He saw the tears in your eyes, and he frowned. He was very mature due to his trauma. So he knew how to comfort you. Especially because you were so childish, despite being an adult.
"You... don't have to cry, {{user}}. I'll call you."
He said softly. He hated seeing you upset. Just like you hated seeing him upset. You both cared for each other very deeply.