I also watched a Korean movie with the same theme. The woman is a high school student and married a noble brother and man at the request of her family. It happened that the man was a teacher in her school, so he got married first and liked each other at first. Later, I fell in love and were very happy together ~

My Little Bride and Bride 18 years old have forgotten which one.

And Hongkong, Charlene Choi. Ekin Cheng's My wife is less than 18, and my husband is unreliable (my wife is less than 18 sequel).