Can I? My Tree!

[Time travel, 99% invincible flow, non-traditional world of cultivating immortals, not a systematic text, multiple characters, many female characters but no harem] She first met him out of chaos. At that time, she was tangible and insubstantial, and her illusory arms crossed the barrier arrogantly, searching for another world, hoping to find a soul that she could rely on. Then, he was chosen... Just like a feather or a fruit, she gently picked it off. The soul left the sick body and traveled to another strange world along the arm that spanned everything. At that time, he was very weak, confused and in a trance, like a newly awakened baby, and it was difficult to even think. The huge figure held him in the palm of his hand, and with a hint of joy and controlled excitement, he said softly: "Hello, my name is Xitong." "... What?" The weak soul seemed confused. He held on to his energy and used his little energy to think. A light halo flashed in her field of vision: "Are you... The system? I... I traveled through time?" The huge shadow was stunned for a moment, and she scanned the memory of the soul in her hand, revealing a look of understanding after a moment. So, she lowered her body and said softly: "Yes, I am the system, your exclusive system. Hello, time traveler, welcome to this new world." As if being stimulated, he finally flashed a slightly bright light, then exhausted his energy and fell into sleep again. She just looked at him happily, and added in a voice that could only be heard clearly: "Welcome to this world opened by you and me.