Honestly I'm not really sure but it cant be too much since they were both kids when their moms died (which was right around the same time). The oldest Cheng had to be was probably 11/12. We know Quing was a lot younger (hence why he doesn't remember much), he says so himself. I'm assuming about 4? I think the difference is about 7 years, give or take a year or two.
Of course if anyone actually knows I don't mind being corrected lmao
╮(￣▽￣)╭
(Of course all this being said it doesn't change the fact that they're teacher/student and its still kinda weird ahdjshsjbs-)
oh yeah I totally forgot about that part lol...but I don't think 7 years is a big difference for a relationship or whatever, if they're both adults (even tho Qingyu only recently became one I think) but it is creepy that Cheng wanted to ruin the life of an innocent teenager...and I'm still not sure what he wants now...is it as the green-haired dude says, that he only wants to possess him, or is he's really falling for Qingyu (〜￣△￣)〜
ok now that they started blushing and all that, what's their age difference? I don't know if it was mentioned in some chapter, I started reading it a long time ago..