for me, I kinda wish the plot would thicken, a lot of angst and have more drama... I’d be really disappointed if it’s only because of the grandfather though... (it’s too cliché and easy to guess and this new season would just feel unnecessary)
After reread the series again i have a wild guess...what if... someone tell haebom the truth behind his parents accident and it has something to do with taesung's family or the grandpa, then haebom can't bear the truth and decide to run awayy...