"Dreaming that we met with a smile without topic, really seeing you again and holding you in my arms" comes from "After You Left 1.0", composed by Wang Enxin Est and Erpang U.

Here are some lyrics:

Since then, I have been alone, resisting contact with people around me.

Paralyze yourself with alcohol aimlessly, pretend to forget,

If the seasons change, the leaves fall to the ground and are wrapped in silver,

I can't walk back to my original place. I'll have another dream for you,

Dreaming that we met, no topic, smiling,

Really see you again and hold you in my arms again.