first of all, my review. great movie. 5 stars. very funny.
secondly, addressing all the negative reviews on here. the movie is based on a true story, and making fun of the situation. the movie is not trying to reflect reality, change the meta, its not trying to normalize anything. in the first part, its making fun of the situation.
in the following parts, its the father trying to bond with his son to try and apologize for being a bad father at a really young age. it does not matter how young the parent(s) are, the situation is the same. was too young to be a good father, and wants to make it up to his son. it turns away from trying to get money, to simply bonding with his son. all of his sons "friends" like hans (the kid of the teacher and the student) father more than him, it kinda shows that the proper guy han is trying to turn himself into is not what people like, but rather people like his chill dad, who han does not initially want to be because he thinks it will make people not like him (except the other way around happens, nobody likes hans personality).
if you dont like comedy and you dont know how to take a joke, dont watch this movie. the movie is not bad because someone outside of its genre doesnt like it.