He goes missing before he starts highschool I think, he appeared at the beggining of the story as a 3rd year wanting to go to the same college as Zhan Xixi, but the author goes on this flashback thats going until now showing them in middle school ,the reason of Jian desapearence is going to be told soon (I hope). The beggining of the story was pretty confusing tho... And I get you, they sure do not look like middle schoolers at all.

So from the before comments, people said that this chapter is from when they’re in middle school but it’s a flashback and jian yi goes missing in high school? When did this happen I’m so confused...? ┗( T﹏T )┛AMERICA EXPLAIN (╯°Д °)╯╧╧
The only thing I know is that Jian Yi looks fiiiiine in a man bun and I just realised I’m sexualising a teen and now I’m a pedo okay I’m leaving now bye...