
Nope still in 3rd year of middle. That's why the girl in chapter 247 asks Jian Yi which high school he plans on going to. We learn in chapter 45 that Jian Yi drops out of highschool his second day and doesn't come back to China until 3 years later. All of this is taking place in middle school when the four of them were still together.

Some of you are so fucking judgmental in the comments, like who do you think yall are?? Even saying some shit like "just go watch porn" or even "they should be seeking for therapy"???? The author themselve is following a NSFW account on Twitter who drew a fanart of Mo and He tian. So why would you be so fucking contemptuous when the author themselve is perfectly fine with those who are "horny" lol? Also, you have to understand that what prevents the author from drawing explicit scenes is China homophobic censorship (that's why chinese manhwas are so fluff, because even the simplest kiss can be removed). But even though the author can't be explicit, it doesn't stop them from giving actual hints of sexual tension. Like, that time Jian Yi was drunk and totally hard and even rubbed against Xi while kissing his neck, or when Mo had this dream in which He tian caressed his butt and when he woke up he immediately looked down to his pants. Also the special chapter in which He tian offered condoms to Mo, or this other special chapter in which they're in a hotel room and He tian proposed to give Mo a "special" massage after seeing that the service proposed a prostate massage, or even some of the official arts which has A LOT of sexual tension in them. I mean, the author themselve heavily implies sexual behaviors even though they can't actually draw smut and they're completely fine with "horny readers who want to see them fuck". So now, what's ur problem? Do you still feel so disdainful towards those "horny" readers?

I mean, I know that lmaooo. As I said, it'd to be way too complicated to have an actual sexe scene because of China's homophobic censure, but I simply can't stand those people who look down on those who expect more as if they were some creepy weirdos or as if it was completely unjustified because even if it's not a yaoi, there is a lot of scenes which imply that they're not completely saint or pure lol. So like.... yeah. Readers can have some hopes too even if it's hopeless lol, let them have some fun and imagine whatever they want.
Don't read too much in Little Mo.
He very much seems like the type of highschooler who doesn't think about sex much yet, which isn't surprising in a comedy.
He's also definitely the type of person who banters and argues even when he agrees. To keep up his thug facade...like majority of people like him.
PS: people who want sex you have issues 'cause nothing in this story built any for of sexual tension so go watch porn and get your mind out of the gutter