As they ate Yujin asked:
"How is grandmother?"
Atlas answered:
"She's strong so I don't doubt that she'll be fine in a couple of days when all the darkness will be out."
Yitian asked:
"Atlas what truly happened that day?"
He and Yujin can tell that the day he disappeared something other than what Yan said happened. Atlas waved his hand and the twins looked in front of them at two apparitions stunned.
They could see through them, when they became clearer they saw that it was Atlas and Yan but they were younger. They were talking and Yan was telling Atlas that he was going to Beast Valley.
After failing to convince him not to go Atlas said that he'll go with him. The apparition disappeared and the twins thought it was over until it reappeared again. They could recognize behind them Beast Valley.
Love's Alchemy: Breaking Shadows