He didn't step further, instead, he lit a cigarette, leaned against the door frame with the brightly painted white wall, and listened to the sounds of teacher-student conversations coming from the classroom while puffing smoke.
"Wow! Shen, your problem-solving approach is simply amazing! In all my years of teaching, I've never thought of it this way! Really... tsk, tsk! May I ask, is this problem-solving method something your previous teacher taught you, or did you figure it out on your own?"
"Teacher, it was taught by Mr. Shang."
Old Sui paused for a few seconds, then confirmed again.
"Shang? Shang Jianghan?"
"Mhm," the girl responded softly.
Then Old Sui's distinctly identifiable laugh followed.
"It would be normal if that kid taught it! After all, he never takes the conventional path!
But with his cold personality, him teaching you? Simply unbelievable!"