These chapters are of them all grown up, after He Tian had an agreement with his brother that he would do some mafia stuff for him and then come back.
When they were younger He Tian left for a few years to do this, that's when Mo's heart was a little broken and he basically mourned Tian, then Tian came back years later (the chapter where he did was the New Year one, or Christmas, one of those)
So right now we are looking at the present (or future if you are looking at the manga as them still in highschool)
Yes, this is a time skip to after they finished school.
- Xixi studied and applies for a job now
-Jian Yi did some unknown things (probably has been gone because of his father's gang affiliations)
-He Tian had to leave the country to build a business (probably also some shady stuff regarding his brother or father)
- Mo got his car job. He's hurt because He Tian left, seemingly without a word or goodbyes but that part of the story must be further explored.
Okay what? Was there like some kind of time skip? Cuz these new chapters don't ad up. Can someone explain what happend? Pls