The light smell of milk brought Samuel back to his senses. He looked at Lucas in a mixed mood. He didn't know what to say.

Lucas did not speak and sat quietly beside him. He seemed to want to sit and didn't care who was next to him.

Samuel found out that he was depressed.

Joseph was also four years old, but he was carefree and willful. He laughed when he was happy and cried when he was sad. On the contrary, Lucas was calm and mature.

The first time he saw Lucas was in the airport bathroom. ...