And this runs afoul of the fact that Sam-gwan is really kind of a jerk. He bullies Ok-ran into marrying him and then arbitrarily bullies his son, such that until the final act we rarely ever actually get to see Sam-gwan the plucky relatable guy. Bizarrely, Ok-ran's ex-boyfriend comes off as way more sympathetic than seems reasonable, given that his moustache practically screams "snide weasel". He's moved on- why can't everyone else?