C89 Pursue like shadow

"Don't you know that it's very impolite to suddenly appear behind someone else?" Nong Xuejia said angrily.

"I've been here for ten minutes." Wei Yi replied blandly, without a hint of happiness or sadness on his face.

"Then that's even more impolite. Hiding outside their door, are you sick?" Nong Xuejia had completely fallen out with Wei Yi, so he was no longer polite when he spoke