In high school.
"Zekai, how did you end up as my homeroom teacher?"
"I happened to come back from overseas and needed a job. It just worked out."
In college.
"Why are you teaching one of my classes now?"
"I happen to have majored in this subject, and the school hired me. What a coincidence."
At work.
"Are you haunting me or what? And why are you my boss?!"
"I got tired of teaching. Besides, this is my family company. If I'm not the boss, who is?"
It starts out as a youthful campus romance, then turns into a CEO story. Pure danmei romance.