Immortal as the Empty Mist

When they first met, he scowled and shoved her away. “Little monk, stop getting in the way!”

Later, he discovers that she is actually a woman?

But that doesn’t matter. She follows in his footsteps and slowly grows stronger.

Then, all of a sudden, his face turns icy as he spits out words that cut deep. “Get lost. Never show your face in front of me again, or I can’t promise I won’t kill you!”

Just as she lets everything go, he suddenly appears again. “Master, long time no see!”