
This one reminds me of a story by Brothers without a tomorrow, where the main characters and their parents fall in love separately but at the same time. If we keep the thing about MC being a minor aside, it was essentially the same thing like people meeting through acquaintances but sadly here the acquaintances are their parents and hence the need to act like family. I just felt really bad for the Mc throughout. Like many others I too believe that MC was much more engaging and fun but its still so sad.

As one of the comments suggested to read 7.1-7.3 as a stand alone short story, thank you. To anyone who might come across this comment: the standalone story was short but it was very painful to read. This one goes to the top of being the most hurtful backstory in a bl story across any nation. The present of the couple is almost sweet.

Reading the comments, i think people are misunderstanding the "buddy buddy" relationship. This is just my take but seemed like ML is essentially making sure that he let's that POS ex know how good Nanase is doing now (and will probably will keep telling him that for years to come since they're 'friends' now) and how happy they're and all, so that he never forgets what he did to Nanase and what he lost doing it. Although I'd love for him to die a really painful death but since that isn't happening, this side of torture is nice too, since the author made it look like the ex had some sort of feelings for Nanase as well.
Having said that I still hope he just rots and dies like the villain in Vincenzo.
THIS is what you call a green flag seme and a beautiful relationship. They're greener than the plants :')